The Cambridge Science Festival is the national leader in its field, with 189 activities and events spanning 10 days, April 12-21, in Cambridge, greater Boston, and beyond. #CambSciFest is too much to keep in your head. You can filter this year’s online schedule of events by date, age (family/teens/adults), cost, various tags, venue, day of the week, time of day, or organizer — and then export your filtered events to your personal calendar. Some events require pre-registration or tickets, and most are free.  Some highlights:

• Opening Night Panel: Mars — Really?: April 12, 7:30-9PM. $10
• Science Carnival and Robot Zoo: April 13, noon-4PM, Cambridge Rindge & Latin School Field House and Cambridge Public Library. Free