Breakdown of tougeikyoushitsu ni sankasuru.

Questions & Answers about tougeikyoushitsu ni sankasuru.
Because 参加する normally takes に for the thing you participate in.
So:
- 陶芸教室に参加する = to participate in a pottery class
- 会議に参加する = to participate in a meeting
- イベントに参加する = to participate in an event
For English speakers, this can feel a little surprising because English uses in after participate. In Japanese, the natural pattern is:
[event / group / activity] + に + 参加する