Grape lovers grab your glasses and head into the 19th Annual Boston Wine Expo, which opens this weekend at the Seaport World Trade Center.Billed as “a global adventure in a glass,” the expo is the premiere local event for wine lovers. With more than 450 wineries represented from all over the world and some 1,800 wines, it is the largest consumer and trade wine show in the country.Along with the wines is the food. From tasty tidbits offered up by exhibitors to the more than 15 celebrity chefs who will be on hand and in action on two different stages, there will be food to try and possibly take home with you.Celebrity chefs include Joanne Weir of American Public Television’s “Joanne Weir’s Cooking Class,” Chef David Burke of Townhouse in New York and David Burke Prime of Foxwoods Casino.Local chefs include Andy Husbands of Tremont 647 and Sister Sorel, Scott Crain of Morton’s Steakhouse, Raymond Ost, chef/co-owner of Harvard Square’s Maitre Cuisiner de France, Chris Douglass, Chef-Proprietor, Icarus, Ashmont Grill, Tavolo and Rachel Klein of Aura Restaurant, a relatively new and wildly popular local chef.The weekend also offers 26 seminars on topics ranging from “Everything You Ever Wanted to Know About Wine but Were Afraid to Ask,” from “Wine Spectator” to the “Power and Grace of Italian Red Wines” and “How to Taste Wine Like a Pro,” to talks on specific wineries and regions.The Grand Tasting is the main attraction, an opportunity to visit 440 wineries from more than 15 countries all under one roof. Participants receive their own wine glass when they stroll through the doors, which is theirs for the duration of the show and to take home.Finding your favorites is fairly simple because various countries and wine regions are grouped together on the showroom floor. Do not be afraid to try wines you thought you didn’t like, however. Wines change all the time. Unoaked chardonnays, ice wines, or specialty wineries could surprise you and become a new favorite.A glossy magazine outlining all the exhibitors present and where to locate them also makes navigation easy. The magazine also leaves room to take notes so you can remember your newly found favorites.The wine expo also has the added advantage of being able to meet the actual winemakers. Participants can speak directly to winemakers and winery representatives about their wines and answer questions as well as offer tips on serving, pricing and selecting the right vintage.If You Go?Saturday one-day tickets are sold out but there are tickets still available for Sunday at $85 each.