Love Philly? So do we. Let’s be friends. Sign up for the Billy Penn newsletter today. No gluten? No problem! This Saturday, over 100 vendors, purveyors, restaurants and bakeries are headed to the Greater Philadelphia Expo Center in Oaks, PA with celiac-safe bites for the whole family. The event, called the Wicked Gluten-Free Expo and Food Festival, will run from 9 a.m. to 3 p.m.Abby Helman Kelly, is the founder and owner of Wicked Gluten Free. S…