A Predicament

Here's the situation a friend of mine found herself in.
One of her friends is involved in a political/activism group, that my friend also has an interest in, and was heading up some times on holistic health within that scene. My friend, naturally, was invited to take part. Along the way she discovered that one of the people involved/going was quite into spells and that kind of thing and wanted to do chant type stuff over everyone. Should she go?
Two opposed lines of thoughts:
Firstly, going opens you up to a range of spiritual influences.
Secondly, what better opportunity to be a presence of the kingdom!

What do you think?