Kids ages 6–12 use some everyday kitchen items to experiment with invisible drawings & uncover them through scientific exploration of chemical compounds. $10–$12. Parking: $7. Two sessions: 11 a.m.–noon & 1–2 p.m. Spring Lake Regional Park Environmental Discovery Center. 393 Violetti Rd., Santa Rosa. Register for 11 a.m. session: tinyurl.com/44njr9z7. Register for 1 p.m. session: tinyurl.com/565z8v2r.