Repository: vacanza/holidays (python)

Issue:
Missing Argentina's One-Time Holiday for G20 Summit in 2018.
2018-11-30 was declared a public holiday in Argentina and is not yet implemented.

**Sources**
https://en.wikipedia.org/wiki/2018_G20_Buenos_Aires_summit
https://argentinareports.com/bullrich-g20-leave-bs-as/2060/
https://www.theguardian.com/world/2018/nov/28/argentina-g20-summit-buenos-aires-public-holiday-leave-town

Mentioned Specifically Here:
https://en.wikipedia.org/wiki/2018_G20_Buenos_Aires_summit#:~:text=Friday%2C%2030%20November%20was%20declared%20a%20one%2Dtime%20public%20holiday%20day%20in%20the%20city%20of%20Buenos%20Aires%2C%20to%20prevent%20the%20traffic%20caused%20by%20people%27s%20daily%20activities%2C%20and%20residents%20were%20urged%20to%20leave%20the%20city%20for%20the%20long%20weekend.

Pull request description:
Update Argentina holidays: add 2018 G20 Leaders' Summit for Buenos Aires
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  Thanks for contributing to holidays!
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## Proposed change

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  Describe the big picture of your changes.
  Don't forget to link your PR to an existing issue if any.
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Adds November 30, 2018, as a one-off public holiday in Buenos Aires for the G20 Leaders' Summit.

Resolves #2528.

## Type of change

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  Type of change you want to introduce. Please, check one (1) box only!
  If your PR requires multiple boxes to be checked, most likely it needs to
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- [ ] New country/market holidays support (thank you!)
- [x] Supported country/market holidays update (calendar discrepancy fix, localization)
- [ ] Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
- [ ] Dependency update (version deprecation/pin/upgrade)
- [ ] Bugfix (non-breaking change which fixes an issue)
- [ ] Breaking change (a code change causing existing functionality to break)
- [ ] New feature (new `holidays` functionality in general)

## Checklist

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  Put an `x` in the boxes that apply. You can change them after PR is created.
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- [ ] I've followed the [contributing guidelines][contributing-guidelines]
- [ ] I've successfully run `make check`, all checks and tests are green

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  Thanks again for your contribution!
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[contributing-guidelines]: https://github.com/vacanza/holidays/blob/dev/CONTRIBUTING.md
[docs]: https://github.com/vacanza/holidays/tree/dev/docs/source


Patch:
diff --git a/holidays/countries/argentina.py b/holidays/countries/argentina.py
index 952ab4c9..bdda17ab 100644
--- a/holidays/countries/argentina.py
+++ b/holidays/countries/argentina.py
@@ -828,6 +828,9 @@ class ArgentinaStaticHolidays:
         * [Release P51020 (2021)](https://bcra.gob.ar/Pdfs/comytexord/P51020.pdf)
         * [Release P51155 (2024)](https://bcra.gob.ar/Pdfs/comytexord/P51155.pdf)
 
+    Special Subdivision-level Holidays References:
+        * [2018 G20 Leader Summit Special Holidays for Buenos Aires](https://web.archive.org/web/20220305033755/https://www.perfil.com/noticias/sociedad/30-de-noviembre-feriado-ciudad-de-buenos-aires-cumbre-g20.phtml)
+
     Special Bridge Holidays are given upto 3 days a year as long as it's declared
     50 days before calendar year's end.
     There's no Bridge Holidays declared in 2017.
@@ -869,6 +872,9 @@ class ArgentinaStaticHolidays:
     # National Census Day 2010.
     national_census_2010 = tr("Censo Nacional 2010")
 
+    # G20 Leaders' Summit.
+    g20_leaders_summit_holiday = tr("Cumbre de Líderes del Grupo de los 20 (G20)")
+
     # National Census Day 2022.
     national_census_2022 = tr("Censo Nacional 2022")
 
@@ -985,3 +991,7 @@ class ArgentinaStaticHolidays:
             (DEC, 31, bank_holiday),
         ),
     }
+
+    special_b_public_holidays = {
+        2018: (NOV, 30, g20_leaders_summit_holiday),
+    }
diff --git a/holidays/locale/en_US/LC_MESSAGES/AR.po b/holidays/locale/en_US/LC_MESSAGES/AR.po
index c322f38f..3635cc78 100644
--- a/holidays/locale/en_US/LC_MESSAGES/AR.po
+++ b/holidays/locale/en_US/LC_MESSAGES/AR.po
@@ -14,18 +14,17 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Holidays 0.70\n"
+"Project-Id-Version: Holidays 0.73\n"
 "POT-Creation-Date: 2023-03-02 00:39+0700\n"
-"PO-Revision-Date: 2025-03-19 13:55+0200\n"
-"Last-Translator: ~Jhellico <jhellico@gmail.com>\n"
+"PO-Revision-Date: 2025-05-06 10:34+0700\n"
+"Last-Translator: PPsyrius <ppsyrius@ppsyrius.dev>\n"
 "Language-Team: Holidays Localization Team\n"
 "Language: en_US\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Plural-Forms: nplurals=2; plural=(n != 1);\n"
 "Generated-By: pygettext.py 1.5\n"
-"X-Generator: Poedit 3.5\n"
+"X-Generator: Poedit 3.6\n"
 "X-Source-Language: es\n"
 
 #. %s (observed).
@@ -367,3 +366,7 @@ msgstr "FIFA World Cup 2022 Victory Day"
 #. Bank Holiday.
 msgid "Asueto bancario"
 msgstr "Bank Holiday"
+
+#. G20 Leaders' Summit.
+msgid "Cumbre de Líderes del Grupo de los 20 (G20)"
+msgstr "G20 Leaders' Summit"
diff --git a/holidays/locale/es/LC_MESSAGES/AR.po b/holidays/locale/es/LC_MESSAGES/AR.po
index 309a52bc..4e7f29a8 100644
--- a/holidays/locale/es/LC_MESSAGES/AR.po
+++ b/holidays/locale/es/LC_MESSAGES/AR.po
@@ -14,18 +14,17 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Holidays 0.70\n"
+"Project-Id-Version: Holidays 0.73\n"
 "POT-Creation-Date: 2023-03-02 00:39+0700\n"
-"PO-Revision-Date: 2025-03-19 13:53+0200\n"
-"Last-Translator: ~Jhellico <jhellico@gmail.com>\n"
+"PO-Revision-Date: 2025-05-06 10:34+0700\n"
+"Last-Translator: PPsyrius <ppsyrius@ppsyrius.dev>\n"
 "Language-Team: Holidays Localization Team\n"
 "Language: es\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Plural-Forms: nplurals=2; plural=(n != 1);\n"
 "Generated-By: Lingua 4.15.0\n"
-"X-Generator: Poedit 3.5\n"
+"X-Generator: Poedit 3.6\n"
 "X-Source-Language: es\n"
 
 #. %s (observed).
@@ -367,3 +366,7 @@ msgstr ""
 #. Bank Holiday.
 msgid "Asueto bancario"
 msgstr ""
+
+#. G20 Leaders' Summit.
+msgid "Cumbre de Líderes del Grupo de los 20 (G20)"
+msgstr ""
diff --git a/holidays/locale/uk/LC_MESSAGES/AR.po b/holidays/locale/uk/LC_MESSAGES/AR.po
index fb5bb590..b34e0e03 100644
--- a/holidays/locale/uk/LC_MESSAGES/AR.po
+++ b/holidays/locale/uk/LC_MESSAGES/AR.po
@@ -14,18 +14,17 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Holidays 0.70\n"
+"Project-Id-Version: Holidays 0.73\n"
 "POT-Creation-Date: 2023-03-02 00:39+0700\n"
-"PO-Revision-Date: 2025-03-19 13:59+0200\n"
-"Last-Translator: ~Jhellico <jhellico@gmail.com>\n"
+"PO-Revision-Date: 2025-05-06 10:34+0700\n"
+"Last-Translator: PPsyrius <ppsyrius@ppsyrius.dev>\n"
 "Language-Team: Holidays Localization Team\n"
 "Language: uk\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Plural-Forms: nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<12 || n%100>14) ? 1 : 2);\n"
 "Generated-By: Lingua 4.15.0\n"
-"X-Generator: Poedit 3.5\n"
+"X-Generator: Poedit 3.6\n"
 "X-Source-Language: es\n"
 
 #. %s (observed).
@@ -367,3 +366,7 @@ msgstr "День перемоги збірної Аргентини на Чем
 #. Bank Holiday.
 msgid "Asueto bancario"
 msgstr "Банківський вихідний"
+
+#. G20 Leaders' Summit.
+msgid "Cumbre de Líderes del Grupo de los 20 (G20)"
+msgstr "Саміт лідерів Групи двадцяти (G20)"
diff --git a/snapshots/countries/AR_B.json b/snapshots/countries/AR_B.json
index 2232aefb..f14ad0eb 100644
--- a/snapshots/countries/AR_B.json
+++ b/snapshots/countries/AR_B.json
@@ -1050,6 +1050,7 @@
     "2018-10-15": "Respect for Cultural Diversity Day",
     "2018-11-06": "Bankers' Day",
     "2018-11-19": "National Sovereignty Day",
+    "2018-11-30": "G20 Leaders' Summit",
     "2018-12-08": "Immaculate Conception",
     "2018-12-24": "Bridge Public Holiday",
     "2018-12-25": "Christmas Day",


Test patch:
diff --git a/tests/countries/test_argentina.py b/tests/countries/test_argentina.py
index e2a6499f..80118d14 100644
--- a/tests/countries/test_argentina.py
+++ b/tests/countries/test_argentina.py
@@ -99,6 +99,10 @@ class TestArgentina(CommonCountryTests, TestCase):
             "2024-12-31",
         )
 
+    def test_special_subdiv_holidays(self):
+        # Buenos Aires.
+        self.assertHoliday(self.subdiv_holidays["B"], "2018-11-30")
+
     def test_new_years_day(self):
         self.assertHolidayName("Año Nuevo", (f"{year}-01-01" for year in range(1957, 2050)))