How old are your choir? Kiddies or real people?
Do you need to worry about arrangements or is it just a case of making people sing?
I have never been in a choir or directed people singing in one.
I coached a sixth-form football team for a game because my mate had parents evening (we won 4-3 after some inspired substitutions) bu the students did most of work. I just swore at them accidentally at half time and made sure they got on the bus home.