June 19-September/October: Oakland A's Baseball Season Oakland Coliseum. For schedule information: (510) 638-4900.

June 19-September/October: Giants Baseball Season Pacific Bell Park. For schedule information: (415) 972-2000.

June 19-December 31: Boyz in the Woodz Club Sunday Hike Join the SF Bay Area Gay & Bi Men's Hiking & Social Club for brunch, a hike, fun events, or dinner ($10-12). (415) 457-3993.

June 19-December 31: Critical Mass Reclaim the streets with other cyclists the last Friday of every month for a tour of San Francisco (free). Justin Herman Plaza.

June 19-23: NASCAR Sears Point Raceway. Come see the Dodge/Save Mart Winston Cup. Sonoma. (800) 870-7223.

June 29: Pride Run 2001 5K and 10K. Golden Gate Park. (415) 978-2429.

June 22: Double Dipsea A 13.7-mile trail run. Stinson Beach parking lot. (415) 978-0837.

June 23: Interwoven San Jose International Triathlon A 1.25-kilometer swim, 24-kilometer bike ride, and a 10-kilometer run. Lake Almaden. (866) 300-7223.

June 28-29: International Gay Rugby Tournament: San Francisco Fog Rugby Football Club hosts The International Gay Rugby Association's rugby tournament and festival. Polo fields, Golden Gate Park (free). 10 a.m.

June 30: Alcatraz Challenge Aquathon & Swim A 1.5-mile swim and a 12-kilometer run. San Francisco. (650) 359-3773.

July 4: Firecracker 10K Santa Cruz. (831) 420-5273.

July 28: Chronicle Marathon Also a 5-kilometer run. Golden Gate Bridge. (415) 284-9490

July 20: The 16th Annual Healdsburg Harvest Century Bicycle Tour A 60-, 37-, or 25-mile route. (707) 433-6935.

July 21: Humbug Hurry-up Mountain Bike Race A 9-mile course along woodland paths ($30). Start/finish line at Upper Greenhorn Park, Yreka. (530) 842-1649.

July 28: Wharf-to-Wharf 6-Miler Santa Cruz to Capitola (831) 475-2196.

July 28: Tiburon Triathlon A .25-mile swim, 9-mile bike ride, and 2-mile run. Belvedere. (415) 425-2677.

August 11: Festival of Chariots The west end of Speedway Meadow, Golden Gate Park. (415) 841-7618.

August 3: 13th Annual Alcatraz Sharkfest Swim A 1.5-mile swim from Alcatraz to San Francisco. (415) 868-1829.

July 26-28: Squaw Valley Full Moon Hike Guided hikes on moonlit trails ($6). Squaw Valley, Lake Tahoe. (530) 583-6985.

August 4: The Chronicle Tour de Peninsula A 33-mile bike ride of the San Francisco Peninsula with 1-mile and 21-mile shortcuts, rest stops, food and drinks, tech support, and expo. (415) 759-2690.

August 8-11: World Footbag Championships Don't call it hacky-sack, these folks are serious. Think volleyball — with your feet. (415) 522-9899.

August 17: Escape From the Rock XXII A 1.5-mile swim, 13-mile bike ride, and 10-mile run. From Alcatraz to San Francisco. (415) 868-1829.

August 18: Vine to Wine 5K & 10K A run/walk in Livermore. (530) 757-6017.

August 25: Aloha Celebrity Races & Polynesian Festival Outrigger canoe races, hula dancing (free). Santa Cruz Boardwalk. (831) 420-5273.

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