Participate in
例句：She participated in the conference last week.
Join in
例句：Everyone is welcome to join in the discussion.
Engage in
例句：The students engaged in a lively debate.
Be involved in
例句：He was deeply involved in the project from the start.
Take part
例句：They took part in the charity run.
Get involved in
例句：Why don’t you get involved in local community events?