Can someone suggest that’s cool like an event, free/minimal fee and indoors to enjoy?

Craft Loft has a bunch of craft related events, a bunch of local breweries have events going on too

I think this ticks all of the boxes ✅

Free Art & Arch tour of Boston Public Library - little less than an hour long & it’s beautiful & filled w history!

Absolutely beautiful & full of v cool history!

This amazing museum is always free!