Subscriber content previewImage from Seattle Tattoo Expo [enlarge] More than 250 tattoo artists from around the world will gather at Seattle Center for the Seattle Tattoo Expo, the Pacific Northwest's largest tattoo convention. SEATTLE — More than 250 tattoo artists from around the world will gather at Seattle Center's Exhibition Hall for the Seattle Tattoo Expo, returning Aug. 14-16 with live tattooing, contests, entertainment and opportunities for attendees to get tattooed by internationally recognized artists.