I'm atheist, and attending my best friends confirmation next week, and i have no idea what to do in a church?

I haven't been in a church since 3rd grade (8th grade now), and i now identify as atheist. i have no clue what even happens in a church, or what to wear (i'm a girl). if anyone could say things i should know/how a confirmation even goes/ what to wear that'd be great!
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