participate in (something) (with one)
To join in some action, situation, or event (with one). They asked me if I would like to participate in the post-show discussion with the other actors. If you don't want to participate in any sports, then I'd like you to do something else that involves socializing with other kids.
participate (in something) (with someone or something)
to take part in something with someone or a group. I will not participate in this activity with you. They don't participate with our team in this contest.