November 6-7, 13-14, 20-21 and 27-28.
Get four people in for $49.99 with this Gilroy Gardens coupon. The main website with the coupon link is here.
If you are a Great America 2010 & 2011 Gold or Platinum Pass, you'll get in for free. If you're a Great America 2010 & 2011 Season pass holder, you'll get in for $9.99 (and you can bring a friend for the same price for either deal).