I am being asked to participate in my sister-in-law-to-be's bachelorette party. Her maid of honor has planned the entire night which has a price tag at this point of over $200 for the night plus paying for the bride. I was not invited to participate in the wedding at all so I am a guest at my only sibling's wedding. Is there a way that I can just say no? I don't want to participate and I do not have the funds to pay over $200 in one night. What is a legitimate, polite way to say that I won't be coming?