Dogs and their pet humans are invited to enjoy an afternoon together on the Gwinnett County Courthouse lawn. The Downtown Dog Day will be held on Aug. 19, 11 a.m. to 2 p.m., at the Gwinnett Historic Courthouse, 185 West Crogan St., Lawrenceville. There will be a flea market, games, contests, demonstrations, doggie-bags, photos, and more. The event is free. For more information, call 770-822-5450.