It was a steamy night in the Strip District for Pittsburgh’s sexiest party of the year — the fifth annual Dirty Ball, where more than 1,000 guests were celebrating the 15th birthday of Attack Theatre, a non-profit performing company that features modern dance, original music, and art.

To kick off summer in the city, the annual Three Rivers Arts Festival will be held June 4-13 Downtown at Point State Park, the Cultural District, and Hertz Gateway Center.

From June 12-August 29, the Carnegie Museum of Art museum hosts Design Competition: New Cottages at Fallingwater in collaboration with the Heinz Architectural Center.

The Omni William Penn Hotel’s Grand Ballroom will be bedecked in Hollywood glamour on June 5 for the California University of Pennsylvania’s President’s Gala, themed “The Golden Age of Hollywood.”

The most fabulous members of Pittsburgh’s gay, lesbian, bisexual, and transsexual community and their supporters will party hard at Divas for Diversity on June 4 at the Pittsburgh Opera.

Pittsburgh kids are invited to trade in their Tonka trucks for the life-sized version at The Junior League of Pittsburgh’s third annual Touch-a-Truck family festival on June 5.

Pittsburgh CLO Guild celebrates its annual Pink Frolic Ball on June 12 at the Pittsburgh Hilton. This year’s ball honors Dolores Bold, grande dame of the Pittsburgh social scene, who passed away in April.

This month, the worlds’ eyes will once again turn to Pittsburgh — and this time they’ll see green. Pittsburgh is the United Nation’s 2010 World Environmental Day North American host city, meant to give a face to environmental issues, inspire people to become active in their environments, promote green understanding and advocate partnerships that will create a brighter and environmentally friendly future.