The Pirates say Piratefest will be on December 14 (from 12:00-7:00pm) and 15 (from 12:00-5:00pm) at the David L. Lawrence convention center. That's a Saturday and Sunday, so I assume there will be an event Friday for season ticket holders as well.
Piratefest should be very interesting this year -- the place should be jammed, and I'm curious to see what the Q+As with Frank Coonelly and Neal Huntington are like compared to years past. The ones I've seen in years past haven't been outright hostile, but there's always been a palpable feeling of tension in the room. It will be interesting to see how much credit Coonelly and Huntington get this year.
Anyway, you can buy tickets now -- they appear to be $12 for adults and $6 for kids.