Calling all chowder makers: Registration is open until May 20 for Lake Champlain International's third annual Fish Chowder Championship. All fish must come from the Champlain Basin for chowder entered in this competition, which features two categories: home cooks and chefs. Prizes include $500 for first place and special recognition for cooks who make chowder with fish they caught themselves. Tasting and judging will be held on May 26 on the Winooski River Walk. For information and registration, go to mychamplain.net.