On Your Barks, Get Set, Go! Alton Baker Park goes to the dogs on Sunday May 19th, when over 1,000 dogs and their people leash up for a 10K, 5K, or 2K run/walk in the park for Greenhill Humane Society's 31st Annual Bark in the Park. Festivities include the runs and walk, canine activities, vendor booths, food trucks, demonstrations, contests, prizes and more. This annual event draws more than 1,000 people and their pets in celebration of the human-animal bond. Bark in the Park is the largest pet event in the Southern Willamette Valley and one of the largest run/walks in Eugene. Runners can participate as an individual with or without a dog and start or join a team.