Add Rio Carnival to agenda

agenda/data.py

@@ -14,6 +14,7 @@ import isodate  # type: ignore
 import lxml
 import pytz
 import yaml
+from dateutil.easter import easter
 
 from . import (
     accommodation,
@@ -65,6 +66,32 @@ def midnight(d: date) -> datetime:
     return datetime.combine(d, datetime.min.time())
 
 
+def rio_carnival_events(start_date: date, end_date: date) -> list[Event]:
+    """List of events for Rio Carnival for each year between start_date and end_date."""
+    events = []
+    for year in range(start_date.year, end_date.year + 1):
+        easter_date = easter(year)
+        carnival_start = easter_date - timedelta(days=51)
+        carnival_end = easter_date - timedelta(days=46)
+
+        # Only include the carnival if it falls within the specified date range
+        if (
+            start_date <= carnival_start <= end_date
+            or start_date <= carnival_end <= end_date
+        ):
+            events.append(
+                Event(
+                    name="carnival",
+                    title="Rio Carnival",
+                    date=carnival_start,
+                    end_date=carnival_end,
+                    url="https://en.wikipedia.org/wiki/Rio_Carnival",
+                )
+            )
+
+    return events
+
+
 def dates_from_rrule(
     rrule: str, start: date, end: date
 ) -> typing.Sequence[datetime | date]:
@@ -333,6 +360,7 @@ async def get_data(
     events += economist.publication_dates(last_week, next_year)
     events += meetup.get_events(my_data)
     events += hn.whoishiring(last_year, next_year)
+    events += rio_carnival_events(last_year, next_year)
 
     events += domains.renewal_dates(my_data)