Catherine’s Butterfly Party, an annual pet adoption event and fundraiser for a foundation started in honor of a girl killed at Sandy Hook School, is taking place again Saturday.  This year's event from The Catherine Violet Hubbard Animal Sanctuary will have 25 animal rescues, 200 adoptable pets and an estimated crowd of 7,000.  The event, raising money for the sanctuary project, will be held at the Fairfield Hills campus in Newtown.  The organization is looking to build an 8 million dollar facility on 30-acres in Newtown.  About half of the money has already been raised.  The project includes a veterinary intake facility and an education center offering animal and nature programming.  Danbury Animal Welfare Society, Bridgeport Cat Rescue, CT Parrot Rescue, Long Island Bulldog Rescue, Lucky Orphans Horse Rescue, House Rabbit Connection, Gimme Shelter, Best Friends Animal Society and the American Society for the Prevention of Cruelty to Animals, or ASPCA are participating Saturday.