Highlights: 4-8 The famous Dublin Horse Show enters its 137th year, attracting Olympic-calibre competition and tens of thousands of spectators from all the world. There's also a lot of shopping and eating...6-8 The mother of all music festivals Lollapalooza settled in Grant Park, Chicago. This year's lineup includes Soundgarden, Erykah Badu, Social Distortion, Arcade Fire, Cypress Hill, Phoenix, Green Day, The Black Keys and Devo. Why was Lady Gaga invited?... 8-15 The 92nd PGA Championship brings golf's greatest players to Wisconsin (Whistling Straits in Kohler)...Now>10/31 at The National Gallery of Art in Washington, DC: Edvard Munch: Master Prints. This exhibit of 60 prints by the artist known to most for The Scream, illustrates his mastery of printmaking techniques.The Munch exhibition is just one event in a DC-wide festival of Norwegian art and culture, 'Norway Comes to Washington'...25 The world's biggest tomato fight is held near Valencia, Spain. During La Tomatina 40,000 people hurl 140 tons of the over-ripe fruit at each other... 30 Tennis fans flock to the US Open which runs through September 12 at Flushing Meadows in New York...