@@ -19,7 +19,7 @@ repos:
           - rst
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.4.4
+    rev: v0.4.7
     hooks:
       - id: ruff
       - id: ruff-format
 
@@ -9,6 +9,7 @@ Alejandro Antunes
 Alexander Schulze
 Alexandre Carvalho
 Anders Wenhaug
+Andrei Klimenko
 Andres Marrugo
 Anthony Rose
 Anton Daitche
@@ -52,6 +53,7 @@ Heikki Orsila
 Henrik Sozzi
 Hugh McNamara
 Hugo van Kemenade
+Isabelle COWAN-BERGMAN
 Jacky Han
 Jacob Punter
 Jaemin Kim
@@ -124,6 +126,7 @@ Simon Gurcke
 Sugato Ray
 Sylvain Pasche
 Sylvia van Os
+Søren Klintrup
 Takeshi Osoekawa
 Tasnim Nishat Islam
 Tewodros Meshesha
 
@@ -1,3 +1,18 @@
+Version 0.50
+============
+
+Released June 3, 2024
+
+- Refactor some holidays with uncommon rules (#1807 by @KJhellico)
+- Add Greenland holidays (#1811 by @Klintrup, @arkid15r)
+- Fix docs: update Italy docstring (#1808 by @arkid15r)
+- Update Italy holidays (#1805 by @KJhellico)
+- Add 2024 Russian Substituted Holidays (#1799 by @PPsyrius)
+- Add Georgian government holiday for May 17, 2024 (#1802 by @PPsyrius, @arkid15r)
+- Add v1 future incompatibility warning (#1801 by @arkid15r)
+- Migrate Japan holidays to ObservedHolidayBase (#1810 by @KJhellico)
+- Synchronize entity dynamic imports (#1794 by @Izzette)
+
 Version 0.49
 ============
 
 
@@ -146,7 +146,7 @@ Available Countries
 .. _ISO 639-1 code: https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
 .. _ISO 639-2 code: https://en.wikipedia.org/wiki/List_of_ISO_639-2_codes
 
-We currently support 147 country codes. The standard way to refer to a country
+We currently support 148 country codes. The standard way to refer to a country
 is by using its `ISO 3166-1 alpha-2 code`_, the same used for domain names, and
 for a subdivision its `ISO 3166-2 code`_. Some countries have common or foreign
 names or abbreviations as aliases for their subdivisions. These are defined in
@@ -439,7 +439,7 @@ All other default values are highlighted with bold:
      - GE
      -
      - en_US, **ka**, uk
-     -
+     - GOVERNMENT
    * - Germany
      - DE
      - States: BB, BE, BW, BY, BYP, HB, HE, HH, MV, NI, NW, RP, SH, SL, SN, ST, TH
@@ -455,6 +455,11 @@ All other default values are highlighted with bold:
      -
      - **el**, en_US, uk
      - HALF_DAY
+   * - Greenland
+     - GL
+     -
+     - da, en_US, **kl**
+     - OPTIONAL
    * - Guam
      - GU
      - Can also be loaded as country US, subdivision GU
 
@@ -12,13 +12,24 @@
 
 # flake8: noqa: F403
 
+import warnings
+
 from holidays.constants import *
+from holidays.deprecation import (
+    FUTURE_INCOMPATIBILITY_WARNING_TEMPLATE,
+    FutureIncompatibilityWarning,
+)
 from holidays.holiday_base import *
 from holidays.registry import EntityLoader
 from holidays.utils import *
 
-__version__ = "0.49"
+__version__ = "0.50"
 
 
 EntityLoader.load("countries", globals())
 EntityLoader.load("financial", globals())
+
+warnings.warn(
+    FUTURE_INCOMPATIBILITY_WARNING_TEMPLATE.format(version=__version__),
+    FutureIncompatibilityWarning,
+)
@@ -67,6 +67,7 @@
 from .germany import Germany, DE, DEU
 from .ghana import Ghana, GH, GHA
 from .greece import Greece, GR, GRC
+from .greenland import Greenland, GL, GRL
 from .guam import Guam, GU, GUM, HolidaysGU
 from .guatemala import Guatemala, GT, GUA
 from .honduras import Honduras, HN, HND
 
@@ -12,7 +12,12 @@
 
 from holidays.calendars.gregorian import JUL
 from holidays.groups import ChristianHolidays, InternationalHolidays, StaticHolidays
-from holidays.observed_holiday_base import ObservedHolidayBase, SUN_TO_NEXT_MON, SUN_TO_NEXT_TUE
+from holidays.observed_holiday_base import (
+    ObservedHolidayBase,
+    SAT_TO_NEXT_MON,
+    SUN_TO_NEXT_MON,
+    SUN_TO_NEXT_TUE,
+)
 
 
 class Botswana(ObservedHolidayBase, ChristianHolidays, InternationalHolidays, StaticHolidays):
@@ -41,16 +46,19 @@ def _populate_public_holidays(self):
         self._add_observed(self._add_new_years_day("New Year's Day"), rule=SUN_TO_NEXT_TUE)
         self._add_observed(self._add_new_years_day_two("New Year's Day Holiday"))
 
-        # Easter and easter related calculations
         self._add_good_friday("Good Friday")
+
         self._add_holy_saturday("Holy Saturday")
+
         self._add_easter_monday("Easter Monday")
-        self._add_ascension_thursday("Ascension Day")
 
-        may_1 = self._add_labor_day("Labour Day")
-        self._add_observed(may_1)
-        if self.observed and self._year >= 2016 and self._is_saturday(may_1):
-            self._add_labor_day_three("Labour Day Holiday")
+        self._add_observed(may_1 := self._add_labor_day("Labour Day"))
+        if self._year >= 2016:
+            self._add_observed(
+                may_1, name="Labour Day Holiday", rule=SAT_TO_NEXT_MON, show_observed_label=False
+            )
+
+        self._add_ascension_thursday("Ascension Day")
 
         self._add_observed(self._add_holiday_jul_1("Sir Seretse Khama Day"))
 
@@ -63,8 +71,10 @@ def _populate_public_holidays(self):
         self._add_observed(self._add_christmas_day("Christmas Day"), rule=SUN_TO_NEXT_TUE)
         self._add_observed(dec_26 := self._add_christmas_day_two("Boxing Day"))
 
-        if self.observed and self._year >= 2016 and self._is_saturday(dec_26):
-            self._add_holiday_dec_28("Boxing Day Holiday")
+        if self._year >= 2016:
+            self._add_observed(
+                dec_26, name="Boxing Day Holiday", rule=SAT_TO_NEXT_MON, show_observed_label=False
+            )
 
 
 class BW(Botswana):
 
@@ -17,8 +17,11 @@
 from holidays.groups import ChristianHolidays, InternationalHolidays, StaticHolidays
 from holidays.observed_holiday_base import (
     ObservedHolidayBase,
+    MON_ONLY,
+    MON_FRI_ONLY,
     TUE_TO_PREV_FRI,
     WED_TO_NEXT_FRI,
+    FRI_ONLY,
     WORKDAY_TO_NEAREST_MON,
 )
 
@@ -84,9 +87,9 @@ def _populate_public_holidays(self):
             return None
 
         # New Year's Day.
-        jan_1 = self._add_new_years_day(tr("Año Nuevo"))
-        if self._year >= 2017 and self._is_sunday(jan_1):
-            self._add_new_years_day_two(tr("Feriado nacional"))
+        self._add_new_years_day(tr("Año Nuevo"))
+        if self._year >= 2017:
+            self._add_observed(self._add_new_years_day_two(tr("Feriado nacional")), rule=MON_ONLY)
 
         # Good Friday.
         self._add_good_friday(tr("Viernes Santo"))
@@ -141,21 +144,21 @@ def _populate_public_holidays(self):
                 tr("Día de la Unidad Nacional")
             )
 
-        if self._year >= 2017 and self._is_saturday(SEP, 18):
-            # National Holiday.
-            self._add_holiday_sep_17(tr("Fiestas Patrias"))
-
-        if self._year >= 2007 and self._is_tuesday(SEP, 18):
-            self._add_holiday_sep_17(tr("Fiestas Patrias"))
+        if self._year >= 2007:
+            self._add_observed(
+                # National Holiday.
+                self._add_holiday_sep_17(tr("Fiestas Patrias")),
+                rule=MON_FRI_ONLY if self._year >= 2017 else MON_ONLY,
+            )
 
         # Independence Day.
         self._add_holiday_sep_18(tr("Día de la Independencia"))
 
         # Army Day.
         self._add_holiday_sep_19(tr("Día de las Glorias del Ejército"))
 
-        if self._year >= 2008 and self._is_thursday(SEP, 19):
-            self._add_holiday_sep_20(tr("Fiestas Patrias"))
+        if self._year >= 2008:
+            self._add_observed(self._add_holiday_sep_20(tr("Fiestas Patrias")), rule=FRI_ONLY)
 
         if 1932 <= self._year <= 1944:
             self._add_holiday_sep_20(tr("Fiestas Patrias"))
 
@@ -12,8 +12,10 @@
 
 from gettext import gettext as tr
 
+from holidays.calendars.gregorian import MAY
 from holidays.calendars.julian import JULIAN_CALENDAR
-from holidays.groups import ChristianHolidays, InternationalHolidays
+from holidays.constants import GOVERNMENT, PUBLIC
+from holidays.groups import ChristianHolidays, InternationalHolidays, StaticHolidays
 from holidays.holiday_base import HolidayBase
 
 
@@ -27,12 +29,14 @@ class Georgia(HolidayBase, ChristianHolidays, InternationalHolidays):
     """
 
     country = "GE"
+    supported_categories = (GOVERNMENT, PUBLIC)
     default_language = "ka"
     supported_languages = ("en_US", "ka", "uk")
 
     def __init__(self, *args, **kwargs):
         ChristianHolidays.__init__(self, JULIAN_CALENDAR)
         InternationalHolidays.__init__(self)
+        StaticHolidays.__init__(self, GeorgiaStaticHolidays)
         super().__init__(*args, **kwargs)
 
     def _populate_public_holidays(self):
@@ -96,3 +100,15 @@ class GE(Georgia):
 
 class GEO(Georgia):
     pass
+
+
+class GeorgiaStaticHolidays:
+    """
+    References:
+        - https://www.matsne.gov.ge/ka/document/view/6173967
+    """
+
+    special_government_holidays = {
+        # Day of Family Sanctity and Respect for Parents.
+        2024: (MAY, 17, tr("ოჯახის სიწმინდისა და მშობლების პატივისცემის დღე")),
+    }
@@ -0,0 +1,96 @@
+#  holidays
+#  --------
+#  A fast, efficient Python library for generating country, province and state
+#  specific sets of holidays on the fly. It aims to make determining whether a
+#  specific date is a holiday as fast and flexible as possible.
+#
+#  Authors: Vacanza Team and individual contributors (see AUTHORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/python-holidays
+#  License: MIT (see LICENSE file)
+
+from gettext import gettext as tr
+
+from holidays.constants import OPTIONAL, PUBLIC
+from holidays.groups import ChristianHolidays, InternationalHolidays
+from holidays.holiday_base import HolidayBase
+
+
+class Greenland(HolidayBase, ChristianHolidays, InternationalHolidays):
+    """
+    Greenlandic holidays.
+
+    References:
+    - https://en.wikipedia.org/wiki/Public_holidays_in_Greenland
+    - https://www.norden.org/en/info-norden/public-holidays-greenland
+    - https://www.timeanddate.com/holidays/greenland/
+    """
+
+    country = "GL"
+    default_language = "kl"
+    supported_categories = (OPTIONAL, PUBLIC)
+    supported_languages = ("da", "en_US", "kl")
+
+    def __init__(self, *args, **kwargs):
+        ChristianHolidays.__init__(self)
+        InternationalHolidays.__init__(self)
+        super().__init__(*args, **kwargs)
+
+    def _populate_public_holidays(self):
+        # New Year's Day.
+        self._add_new_years_day(tr("Ukioq nutaaq"))
+
+        # Maundy Thursday.
+        self._add_holy_thursday(tr("Sisamanngornermi illernartumi"))
+
+        # Good Friday.
+        self._add_good_friday(tr("Tallimanngorneq ajortorsiorneq"))
+
+        # Easter Sunday.
+        self._add_easter_sunday(tr("Poorskimi"))
+
+        # Easter Monday.
+        self._add_easter_monday(tr("Poorskimi ullut aappaat"))
+
+        # Great Day of Prayers.
+        self._add_holiday_26_days_past_easter(tr("Ulloq qinuffiusoq"))
+
+        # Ascension Day.
+        self._add_ascension_thursday(tr("Ulloq Kristusip qilaliarnera"))
+
+        # Whit Sunday.
+        self._add_whit_sunday(tr("Piinsip ullua"))
+
+        # Whit Monday.
+        self._add_whit_monday(tr("Piinsip ulluisa aappaanni"))
+
+        # Christmas Day.
+        self._add_christmas_day(tr("Juulli"))
+
+        # Second Day of Christmas.
+        self._add_christmas_day_two(tr("Juullip aappaa"))
+
+    def _populate_optional_holidays(self):
+        # Epiphany.
+        self._add_epiphany_day(tr("Mitaarneq"))
+
+        # International Workers' Day.
+        self._add_labor_day(tr("Sulisartut ulluat"))
+
+        # National Day.
+        self._add_holiday_jun_21(tr("Ullortuneq"))
+
+        # Christmas Eve.
+        self._add_christmas_eve(tr("Juulliaqqami"))
+
+        # New Year's Eve.
+        self._add_new_years_eve(tr("Ukiortaami"))
+
+
+class GL(Greenland):
+    pass
+
+
+class GRL(Greenland):
+    pass