As an amateur meteorologist, the map in motion suggests the rain will pass in little bit. It might not be a beach day, but we can go outside without using an umbrella.
Sunday & Monday options on the calendar.
10am to 6pm
Annual Coolidge Corner Arts Festival
at Devotion School Grounds, 347 Harvard St, Brookline (Coolidge Corner)
This is one of those cheap events that enhance a trip to a particular neighborhood. Grab a meal or a movie, and you can stroll over to the arts/crafts festival. You might not be able to buy any art for $10, but it's not bad to walk around and look at what people are creating in a variety of media.
If you're hungry, local restaurants will be selling samples (aka Annual Brookline Food Festival) via $2 tasting tickets from noon to 3pm. Net proceeds will be donated to the Brookline Food Pantry.
11am to 4pm
Historic New England Open House
at Various Locations in MA, ME, NH, RI, and CT
It would be great to pop into any of the historic buildings anytime we like. Some are simply not open on a regular basis, and some charge an admission fee which makes sense to care for these humble abodes dating back to the 17th century. (Thank you, Historic New England, for all your work.)
If you're not $5 (or whatever) interested, lookie-loos are invited to take a tour around a bunch of these places. Most begin on the hour, and space is first-come, first-serve.
If you haven't been to Beauport (Gloucester), it is worth the price of admission on any other day of the year. And there is some amazing architecture to appreciate among the 32 properties around the region (half of them in MA).
Noon to 6pm
Annual Cambridge River Festival
along Charles River, Memorial Dr, Cambridge (near Harvard Sq)
* Rain or Shine *
Even when its not a magnificent summer day, I enjoy walking along the Charles. Pedestrians, vendors, and take over Memorial Drive while performances and activities line the riverside and and the city side.
Check out the Folk & Roots Stage and the Jazz & Gospel Stage at any time (but one would be happy just showing up at 5pm for Kingsley Flood). Comedy and drama can be found on the Theater Stage, and a wide array of styles will grace the Interactive Dance Stage. Arts, crafts, stories, poetry, and so on abound.
I'm not sure how it counts, but the Central Square Theater is also hosting excerpts from "Car Talk: The Musical!" and stagecraft workshops.