Celebrate astronomy and science all day and night with talks, science demonstrations, hands-on activities, safe sun viewing, environmental education, history exhibitions and a few surprises. Special guests include James Albury and Dean Regas, co-hosts of PBS’ Star Gazers.
Noon-11 p.m. Saturday. $7 adults; $5 kids. Cincinnati Observatory, 3489 Observatory Place, Mount Lookout, cincinnatiobservatory.org.