The first New York edition of London's FRIEZE Art Fair doesn't open to the public until May 4, but MoMA PS1 welcomes them to the city with a big party tonight. Martha Wainwright will perform a full set in the museum's courtyard dome to kick-off the event. She's planning to include a couple of her famous Edith Piaf covers along with her own music, plus some Kraftwerk-inspired tributes.  Later that night there's a DJ set by Mark Ronson. 

MoMA PS1, 22-25 Jackson Ave., Long Island City, Queens. 8-11 p.m. Tickets $25 in advance, $50 at the door, and available here.

Your ratty New Yorker tote bag is cute, and makes a statement about your sharp intellect and core values, but just isn't going to cut it in this town anymore. Head to the Botkier sample sale today,  where designer Monica Botkier's sturdy, rocker-esque leather bags are 50 to 70 percent off.

225 Fifth Ave., near 26th St. 11 a.m.-8 p.m. Through May 6.

Former n+1 editor Chad Harbach's much-heralded debut, baseball-themed novel, The Art of Fielding, is now out in paperback, so all you cheapskates out there can finally read it. Head to tonight's paperback release party, where Harbach will be chatting about the novel, and signing copies. 

powerHouse Arena, 37 Main St., DUMBO, Brooklyn. 7 p.m. Free.