You're running into the same issues that were the impetus for trying to establish the URSNY as a formal, legally recognized organization as opposed to just having our informal URS group here.
As I understand it, in New York state, you can't legally hold a raffle unless you are a recognized non-profit organization that has been in existence for at least three years.
When you consider liability issues, legal responsibility for contracts, fiduciary responsibilites, etc. there's a lot involved with putting these events together... particularly using venues that aren't donated by an interested party. It may be easiest to use the Strong Museum room again if Tad can make that happen.
Happy to help out as I can...
Cheers,
Mark