FREE. Walk thru gardens & catch a glimpse of butterflies & birds. Children’s activities, wildflower display & sale of plants, books & crafts. Two time slots: 10 a.m.–2 p.m. or noon–4 p.m. Hallberg Butterfly Gardens. 8687 Oak Grove Ave., Sebastopol. Registration required for morning or afternoon slot: hallbergbutterflygardens.org/open-gardens.