I hacked the current implementation during the conference, just looking at some ical feeds responses, asking Claude for help and validating via https://icalendar.org/

Things to fix:

• Line folding for long content lines
• Line breaks as CLRF
• Escaping characters ,, :, ;, \, \n, \r\n
• Perhaps truncate description to ~2000 chars (practical limitation in popular calendars like Google Calendar is 8kb)