Geraldine’s Bakery will celebrate its recent opening with an open-house event 8 a.m. – 4 p.m. Saturday, Dec. 14. Geraldine’s, located in the former spot of Sisters McMullen Bakery on Merrimon Avenue, opened its doors on Nov. 18 after owner Fred Dehlow, a second-generation baker from New York, bought the business from Andrea McMullen.