Overhaul categorization on events page

[benjie]

Currently the Google Calendar is being treated by the website as returning only "(technical) working groups"; however it also contains foundation working sessions, board meetings, and other relevant events (including Locals and events that GraphQL has a presence at, such as APIDays).

This PR:

• overhauls the categorization logic by heuristically recognizing the calendar titles and bucketing them as such
• splits out "foundation meetings" from "working groups" (but does not add any styles for the former)
• shows "major" events before "minor" events - i.e. conferences and locals before working groups/foundation meetings
• changes the link for calendar events to be the event location (if it's a URL) or the first link in the description otherwise
• changes the location for calendar events to be from the calendar
• expands the visibility window for working groups to 35.5 days so we can be sure at least one of each type is shown
• applies the visibility window to foundation meetings and working groups, but not other events on the calendar (e.g. conferences, locals, etc)
• excludes GraphQLConf coming from the calendar to avoid duplicating manual definition
• shows the tags in a consistent order (conferences > meetups > working groups > foundation meetings)

[vercel]

@benjie is attempting to deploy a commit to the The GraphQL Foundation Team on Vercel.

A member of the Team first needs to authorize it.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
graphql-github-io	Ready	Preview, Comment	Feb 5, 2026 2:49pm

[martinbonnin]

Looks great! Thanks! Just one minor comment.

[benjie]

Discussed at today's GraphQL Foundation Working Session (previously: Marketing & Content Committee) and approach was approved.

cc @hasparus for visibility since this changes quite a lot of stuff!