Kick off the season with complimentary wine, champagne, and tasty hors d’oeuvres. The day-long party will continue into the evening with dinner, dancing, and live music by Paul Mahos and New Life Crisis. 5 p.m. Dockers Waterside Restaurant, 94 Dune Rd., East Quogue, 631-653-0653; dockerswaterside.comARF's 40th Anniversary Celebration
Celebrate this great organization’s 40th anniversary. Bring your pets and enjoy a fun morning of games, contests, and yummy treats. 10 a.m.-NOON. ARF Adoption Center, 90 Daniels Hole Rd., East Hampton; arfhamptons.orgEast Coast Premiere of 'Penny & Red: The Life of Secretariat's Owner'
Penny & Red: The Life of Secretariat's Owner will premiere at the Hampton's Take 2 Documentary Film Festival. Directed by Jacqui Lofaro of Bridgehampton, the film tells the inspiring story of Penny Chenery, the proud owner of Secretariat, 1973 Triple Crown winner. The documentary is narrated by Diane Lane who played Penny Chenery in the 2012 film, Secretariat. $15. 2:30 p.m. Bay Street Theatre, 1 Bay St., Sag Harbor, 631-725-9500; ht2ff.comThe Counter Clockwise Ensemble
Listen to the sounds of The Counter Clockwise Ensemble’s guitar, string, and percussion quintet as they perform a variety of contemporary American camber music. Enjoy their renditions of compositions by Rich Stein, Holst, and Copland, as well as traditional Irish and American folk tunes. $20. 7 p.m. Southampton Cultural Center, 25 Pond Ln., Southampton Village; southamptonculturacenter.orgARF Designer Showhouse and Sale
This incredible designer showcase will feature rooms styled by some of New York’s most illustrious interior decorators. All proceeds from the event will benefit ARF’s mission to find loving homes for animals in need. ARF Thrift and Treasure Shop, 17 Montauk Hwy, Water Mill; arfhamptons.org28th Annual Garden Tour
Enjoy a self-guided tour of six beautiful private gardens in the Springs. Tickets for the 6-hour tour are $75 and begin at 10 a.m. arfhamptons.org