Fix calendar generation

Author: johncarl-te

bin/build-calendar-ics.py

@@ -4,10 +4,20 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
-from datetime import UTC, datetime
+from datetime import datetime, timezone
+import os
 from pathlib import Path
+import shutil
+import sys
 from zoneinfo import ZoneInfo
-import tomllib
+
+try:
+    import tomllib
+except ModuleNotFoundError:
+    py312 = shutil.which("python3.12")
+    if py312 and sys.executable != py312:
+        os.execvp(py312, [py312, __file__, *sys.argv[1:]])
+    raise RuntimeError("build-calendar-ics.py requires Python 3.11+ or an available python3.12")
 
 
 ROOT = Path(__file__).resolve().parent.parent
@@ -68,7 +78,7 @@ def parse_front_matter(page_path: Path) -> dict:
 
 def parse_utc(timestamp: str) -> datetime:
     # Content stores UTC timestamps with trailing Z.
-    return datetime.fromisoformat(timestamp.replace("Z", "+00:00")).astimezone(UTC)
+    return datetime.fromisoformat(timestamp.replace("Z", "+00:00")).astimezone(timezone.utc)
 
 
 def ical_escape(value: str) -> str:

static/calendar.ics

@@ -217,4 +217,19 @@ DESCRIPTION:BitDevs is a place for open discussion of the technical aspec
  ard to gain admission\, but you do not need to RSVP in public.
 URL:https://trianglebitdevs.org/socratic-seminar-50/
 END:VEVENT
+BEGIN:VEVENT
+UID:socratic-seminar-51-20260408t220000z@trianglebitdevs.org
+DTSTAMP:20260408T220000Z
+DTSTART;TZID=America/New_York:20260408T180000
+DTEND;TZID=America/New_York:20260408T200000
+SUMMARY:Socratic Seminar 51
+LOCATION:Fidelity Investments - Corporate Office\, Durham\, North Carolin
+ a
+DESCRIPTION:BitDevs is a place for open discussion of the technical aspec
+ ts of bitcoin and related protocols. Be advised: discussion will be tech
+ nical. Please RSVP or email trianglebitdevs at protonmail dot com to con
+ firm your attendance. You will be required to show ID to the security gu
+ ard to gain admission\, but you do not need to RSVP in public.
+URL:https://trianglebitdevs.org/socratic-seminar-51/
+END:VEVENT
 END:VCALENDAR