my sis wants to renew her vows

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i am helping with the set up and am not sure where to go from here i know where to rent the hall and we have been working on the guest list but i am not sure what to do with food is a caterer a good idea or should we go buffet style since neither of them is religious who should do the vows a judge or is there some other kind of pweson and how do we go about getting them. i have until feb to do all this but any answers would be helpful this is the 15 year of marriage