Today is Cinco de Mayo, so get down to La Fondita in Amagansett for some holiday specials. Saturday, Southern fare and mint juleps will be served at a Kentucky Derby party at Baron’s Cove in Sag Harbor from 4 to 7 p.m. Sunday, Flowers are the focus, along with food, at the Living Room restaurant and c/o the Maidstone in East Hampton. Sunday’s Mother’s Day brunch will include bouquets for moms whose families or friends make arrangements with the inn ahead of time.