Can I attend a non-denominational youth group?

I’m a Catholic teen. I will start my own youth group this school year (because I’m going into ninth grade). But before then, every week (including today) I am invited to a non denominational youth group on Wednesday. It starts with worship music then sermon then alter call. Am I allowed to attend? Is it sin? Should I deny the invitation? Thanks and God bless.

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**Recommended Reading:
*]Are non-denominational Bible studies ok for Catholics?
*]Is it okay to attend a Protestant Bible study?
*]Why can’t we evangelize at a Protestant Bible study?
*]Is it a sin to worship in other Christian churches?

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