Noun, する verb, and の adjective
さんか
やっと順番がまわってきて、ゲームに参加することができました。
My turn came at last and I was able to participate in the game.
あなたもトーフグの忘年会に参加しませんか。きっと楽しいですよ。
Why don't you participate in Tofugu's end-of-year party? It will be fun!
久々の飲み会参加でエンジョイしちゃってまーす。今日は超リア充って感じだよ〜。
It’s been a while since I participated in a drinking party and I’m really enjoying it. I’m feeling super-charged!
When you participate, adding yourself to the activity, that is participation. Well done, you earn a gold star for participating!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.