This year, the Watermill Center is celebrating its 25th annual summer benefit with the explosive theme Time Bomb. It will be held on July 28, but those who cannot wait for the revelry can bid now at Artsy on auction items that will close the night of the party.Some of this year's highlights include:• Dinner for 10 with Marina Abramovic, catered in your home by Cipriani.• "Bedroom," a woodcut and screenprint by Roy Lichtenstein from 1990.• The sculpture "Kuchisake-Onna (Shape Shifter of Mouth Tear Woman)" by Masako Miki from this year.• Peter Beard's photograph "Kenya Bull Elephant Reaching for the Last Branch on a Tree."• The photograph "Keith Haring (on Skateboard)" by Tseng Kwong Chi from 1986.There are works in several mediums by artists who range from international superstars to more local heroes. Opening bids start at $450 with some lots beginning in the several thousands. Daneyal Mahmood is the curator for the online auction. The online bidding closes at 4 p.m. on July 28 and then continues on site.This year's benefit installations and performances are curated by Noah Khoshbin and Ivan Cheng. Cocktails, from 6 to 8 p.m., cost $650, and dinner tickets start at $2,000. Discover Watermill Day, a free community event at which some of the art installations and performances from the benefit are recreated, will be held on Aug. 12.