Well the second date on the "Casino Tour" has been published (there better be a more official name for these shows, otherwise from here on out, I'm dubbing it "The Casino Tour").
According to MGM Foxwoods, CT Twitter page - Stevie Nicks will be playing the MGM Grand at Foxwoods August 28, 2010. No ticket sale dates have been made available.
Tickets are rumoured to go on sale May 14th at 9:00 AM with 3 levels of pricing. Not sure if this date is the start of the presale date (if there is one) or the general to the public sale: