Larry's Diner typically does a brisk business. But on Thanksgiving, when most people eat at home, Larry's is busiest of all. That's because senior citizens can eat a holiday feast for free that day. This Thanksgiving, restaurant owner Kostas Alexopoulos, his family and staff will host the 16th annual dinner. People 62 and older will dine for free from 11 a.m. to 5 p.m. at the restaurant, on the corner of Lockport Street and Van Dyke Road in Plainfield.