The Buzz, Frieze New York Returns Nicholas Hunt/PatrickMcMullan.com The Frieze New York Kick-Off Party in May 2012. It returns on Friday. A Preview of the Week Ahead Frieze New York returns this week with more contemporary art, more fancy food and, of course, more parties. With 180-plus galleries this year, get there early. Frieze holds a vernissage for collectors and V.I.P."s. Randalls Island, friezenewyork.com. Thursday, 6 to 9 p.m.; invitation only. Missed the Jeff Koons opening at David Zwirner on Wednesday? A dueling show takes place at Gagosian Gallery. Gagosian Gallery, 555 West 24th Street, gagosian.com. Thursday, 6 to 8 p.m.; open to the public. The Russian heiress Dasha Zhukova and Michael R. Bloomberg host a dinner to celebrate Circle, a new arts-and-tech initiative in St. Petersburg, Russia. Casa Lever, 390 Park Avenue. Thursday, 7:30 p.m.; invitation only. Maria Baibakova, another Russian heiress, hosts a dinner for Artspace, an online art market. James Burden Mansion, 7 East 91st Street. Thursday from 8:30 p.m.; invitation only. Matthew Barney enlivens the Morgan Library and Museum with a retrospective of his drawings. Opening followed by dinner. The Morgan Library and Museum, 225 Madison Avenue, themorgan.org. Thursday from 8 p.m.; invitation only. The American artist Paul McCarthy takes over Hauser & Wirth's 25,000-square-foot gallery. Hauser & Wirth, 511 West 18th Street, hauserwirth.com. Friday, 6 to 8 p.m.; public opening followed by private dinner. Don't call it a pop-up bar. The German artist Tobias Rehberger recreates the Bar Oppenheimer in Chelsea. Hotel Americano, 518 West 27th Street. V.I.P. opening Friday, 8 p.m.; open to the public from Saturday. Cecilia Dean and James Kaliardos celebrate a new "indestructible" issue of Visionaire. The Clocktower, 108 Leonard Street. Saturday, 9 p.m. to midnight; invitation only. Cocktails to mark the opening of Expo 1: New York, an eco-exhibit at MoMA PS1. Museum of Modern Art, entrance on West 54th Street. Saturday, 9:30 p.m.; invitation only. The art crowd decamps to Greenwich, Conn., for Peter Brant's survey on Andy Warhol. The Brant Foundation Art Study Center, 941 North Street, Greenwich, Conn., brantfoundation.org. Sunday, noon to 5 p.m.; invitation only.