Fundraisers and free beats are popping up on the South Fork this weekend:
STRETCH SPINS Not only has DJ and producer Stretch Armstrong spun deep hip-hop, reggae and other underground beats in Manhattan for more than two decades, but he's helped some of rap music's biggest artists get their big break via his work in radio -- so obviously he's got some skills. Catch him -- for free -- as he contributes some mixing live to the "Summer Set Saturdays" party place noon-7 p.m. Saturday at the Montauk Beach House (55 S. Elmwood Ave.) RSVP at firstname.lastname@example.org, details at thembh.com.
1 OAK in Southampton. Given that he's the longtime boyfriend of Kourtney Kardashian, who is summering in the Hamptons while filming the next installment of her reality show, bank on a crowd of folks RSVPing for table service (via email@example.com, 631-204-5433).
Meanwhile, iconic fashion designer Calvin Klein is only one of the boldfaced names slated to take part in Saturday night's 14th Annual Midsummer Night Drinks, 6-9 p.m. in Southampton in support of the nonprofit God's Love We Deliver -- tickets start at $350 (glwd.org).
Also, the Ellen Hermanson Foundation's annual Summer Solstice gala runs 7-9 p.m. at the home of newsman Chuck Scarborough, with tickets beginning at $300 (includes an after-party at Redstix in Water Mill). Tickets available via shop.ellensrun.org.