I found this today on PotterParties.com:
Half-Blood Prince Party at Barnes & Noble East Towne in Madison.
YAAAY! I'll be there and I'll bring my daughter (who's almost 9) with me. Anyone else? I see there will also be a party at the New Glarus Public Library, as well as parties in Oshkosh and Menasha.
Less than 8 weeks to go!!