City of Oaks Foundation October 4, 2018 OWL-Oween 2018! A Nature Program at Joslin Garden City of Oaks Foundation October 4, 2018 Owls! Owls! And more owls! Get ready for Halloween and learn about owls (and other birds) in a beautiful outdoor setting at Joslin Garden on Sunday, October 28th, from 2PM - 5PM.