I am going to be DIYing a lot of things and just realized that if as few as 6 guests don't come I will need one less centerpiece (and other table decor such as runners, candles, etc.). I'm trying to figure the expenses of everything I hope to do and would really hate buying/making more than necessary. But not having enough would be worse! Do I make several but wait on the last few until I get my RSVP's back? How are you all figuring everything?