Cool. The more, the merrier.
It's definitely unlimited proxies. Here's an excerpt from Jason, the store owner and lvl 3 judge whose been hosting tournaments since 95':
It is unlimited proxies. The cards must be written on, no pieces of paper as the paper can come out of the sleeve. I am not sure what the turnout will be since we don't do these very often, but I would expect somewhere between 12 and 25.
Also, there is no fee for the proxies.
There you have it. If you're going to be in MN on the first of December, attend!