If the guests are to write anywhere they want, you may have problems when it comes time to finish. Older signature quilts usually controlled where names/sentiments were placed so they were not buried by stitches. I have been involved in some of these projects and strongly advise the bride to provide squares (stabilized on a firm backing), not a complete top, for her guests. A comfortable table and chairs would make it easier to write. Folks unused to writing on fabric can have a difficult time and worry about mistakes. It's a lot easier to discard a square with an error than to rip it out of a finished top, and also not embarrass the erring person or distress the bride.
And AliKat is 100% correct with her suggestions. Have full time supervision. (I haven't a clue about pricing.)
Last edited by Greenheron; 12-26-2012 at 06:27 PM.