The Pacific Northwest's largest city and a longtime center of gay activism throws the hugely attended Seattle Gay Pride Parade in late June (on June 28-29 in 2014) - it drew more than 350,000 people last year. Also during the weekend is the Annual Seattle Pridefest, a free event at Seattle Center that draws more than 100,000 participants. Seattle's Pride celebrations take place after Capital City Pride in Olympia and Spokane Gay Pride in the eastern part of the state, and this year it'll be two weeks after Portland Gay Pride, just down the I-5 in Oregon.
Quite a few Pride-related events take place during the days leading up to the big Pride weekend. Check the Seattle Pride Events page and Seattle PrideFest Schedule page for details. And mark your calendar for Saturday, June 28, when the Seattle Dyke March takes place (5 until 7 pm) at the Seattle Central Community College Plaza (Broadway Ave. E at E. Pine St.).
Also on Saturday, June 28, Seattle Capitol Hill Pride Festival is a massive community event that lasts from 11 am till 10 pm and is right in the heart of the city's main GLBT neighborhood. It features food, music and entertainment (from bands to DJs) on three different stages, a block party, a Paint For Pride Artwalk along Broadway, a Doggie Drag Costume Contest, and more than 100 vendors from local businesses and organizations. One other fun event Saturday is the Seattle PrideFest Family Day, held from noon until 5 in Capitol Hill's lovely Cal Anderson Park.
The Official Seattle Pride Parade is held the following day, on Sunday, June 29, and begins at 11 am at the corner of Union Street and 4th Avenue. It lasts until around 1:30 pm and runs north along 4th Avenue to Denny Way. Here's a map of the parade route. Prior to the parade, at 8:30 am, there's a Pride Brunch at the Palace Ballroom.
Sunday's other big event is Seattle Pridefest at the Seattle Center, which takes place from noon until 8 pm in the shadows of the iconic Space Needle and featured entertainment last year from Justin Utley, God Des & She, Alsace Carcione, and many more, plus a DJ stage, a Mural Stage, and an Acoustic Stage. Billing itself the "largest free Pride festival in America," this one attracts some pretty huge crowds.
Additionally, numerous Seattle gay bars as well as gay-popular restaurants, hotels, and shops have special events and parties throughout Pride Week. Check local gay papers, such as Seattle Gay Times and the Seattle Lesbian for details. Another great asset is the Greater Seattle Business Association (GSBA), the city's LGBT chamber of commerce, which produces a handy directory of businesses in the city's gay and lesbian community. Also take a look at the very useful GLBT site produced by the city's official tourism organization, Visit Seattle.