Weekend picks: Beerathon, Kid Rock and more

Beerathon
Twenty-six bars around the city are each offering one special brew. A ticket gets you access to the bars and beers. (Sat., 11 a.m., $65, check in at Amity Hall, 80 W. Third St., tix at nycbeerathon.com)

"Beyond Planet Earth: The Future of Space Exploration"
Space travel's next and future steps are the focus of this exhibition, opening Saturday. (Sat.-Aug. 12, FREE-$19, American Museum of Natural History, 79th Streett and Central Park West, 212-769-5100)

Union Square Holiday Market Opening
Let the holiday shopping begin. Peruse this massive market's stalls, filled with jewelry, accessories, crafts and sweets. (Fri.-Dec. 24, FREE, Union Square, 14th to 17th streets, btwn Fourth Avenue and Park Avenue S.,unionsquarenyc.org)

Ani DiFranco
See this folk icon belt out her songs dealing with political and religious topics, as well as autobiographical ones. (Fri., 9 p.m., $48, Music Hall of Williamsburg, 66 N. Sixth St., Williamsburg, 718-486-5400)

Kid Rock
Kid Rock brings his unique blend of rock, hip-hop and funk to the Beacon. (Sat., 8 p.m., $49.50-$89.50, Beacon Theatre, 2124 Broadway, 212-465-6500)

Oyster Shuck-Off
It's a battle between East Coast and West Coast oysters at this foodie frenzy. (Sat., 3 p.m., $25 for snacks and drinks, plus $2-$4 per oyster, Back Forty, 190 Avenue B, 212-388-1990)