Philly’s finest: The Mayfair Business Improvement District and WIP celebrated a “Go Birds Christmas” on Sunday at Factory Donuts. The afternoon featured food and appearances by Santa Claus and retired Eagles linebacker Bill Bergey. Visitors also donated gifts for the United States Marine Corps Reserve’s Toys for Tots initiative. Factory Donuts rewarded donors with a free doughnut and hot chocolate. Marinucci’s Deli provided lunch, and Dunphy Ford brought prizes and giveaways. The final “Go Birds” pre-game show will take place on Dec. 30, from 10:30 a.m. to 12:30 p.m. at Chickie’s and Pete’s, 4010 Robbins Ave.