Didn't see a thread for Vegas. Last Vegas GP the Vintage sides topped 30. ChannelFireball has put them at what I feel is a good start time of 1:30pm, allowing for a gentlemans brunch around 10am and time to get to the hall.
Schedule here : HYPERTEXT PROTOCOL LINK
They are fixed 4 rounders like most GPs and pay out in Zenny. These are really a chance to try out new and interesting decks with the low EV and low entry. (Hint: Don't play Dredge)
There's CF Rules Old School at 6:30 if you are into their somewhat nonsensical rule set.
Of course all of this is sanctioned. Be great to meet Vintage players from around the world! Team Tusk will be there in some force.