• 参加さんか — participation
• 参拝さんぱい — visiting a shrine
• 参照さんしょう — reference
• 参議院さんぎいん — House of Councillors (Japan)
• 持参じさん — bringing something (with you)
• お参まいり — shrine/temple visit

参 originally carried the sense of “going toward a higher place” and later developed into participation or respectful attendance. The kun-yomi まいる is especially polite and used in humble expressions, particularly when visiting shrines or addressing superiors.

神社じんじゃに 参まいりました。
I visited a shrine.

この会議かいぎに 参加さんかします。
I will participate in this meeting.