@gilles I’ve now implemented the follow-up I mentioned above:
It adds a generic Event → Set attendance operation, with:
- attendee
- attendance state: Going / Interested / Not going / Remove attendance
- topic ID
- optional actor
So your original use case can be built as:
Post created → If first post → Event / Set attendance
using the event author as the attendee and setting them to Going.
I tested that exact pattern locally in the Workflows GUI, stacked on #42932, and confirmed the user is automatically registered as Going on the event.
The PR is currently a draft only because it depends on #42932. Once #42932 merges I’ll rebase it onto main, which will leave the attendance-only diff.