Are there guidelines for Catholics attending Protestant services?

I am searching my resources for the guidelines for Catholic attending protestant services. I don’t but have friends that do. They say “I know you won’t but I attend with my daughter” for instance. I haven’t found a place to go for an answer to this one.

These links should be helpful for understanding what role Catholics may have in non-Catholic services. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
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*]Could Catholics attend Protestant services before Vatican II?

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