The ten-day-long Cambridge Science Festival continues until April 21 with activities throughout Cambridge and greater Boston, with too many events to list here. You can filter their 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 random highlights from just the next few days:

• Photographing Black Holes: First Results from the Event Horizon Telescope,
  April 15, 3:30PM-5PM, Harvard Science Center Hall B, 1 Oxford Street, Cambridge.
• Observe the Moon Week, April 14-20, 6PM-8:30PM, New England Sci-Tech, 16 Tech Circle, Natick.
• Building Perception, April 16-20, dawn til dusk, University Park Commons, 65 Sidney Street, Cambridge.
• MIT.nano: Step Into the Nano Age, April 16, 11AM-3PM. Free tours of MIT’s new nano research facility, MIT Building 12, 60 Vassar Street, Cambridge.
• Finding Wild in the City, April 16, 1PM-3PM, Arnold Arboretum, 125 Arborway, Jamaica Plain.
• Engineering with the MIT Society of Women Engineers, April 16, 2PM-4PM, $23, pre-registration required. MIT Museum, 265 Main Street, Cambridge. Hands-on design challenges. Families welcome.