Lots of eventers in/around Boston, you will not be disappointed. I actually think it’s becoming a mecca of its own as there are LOTS of destination events in Area 1. I love Scarlet Hill in Groton, Orchard Hill has a fun XC course to school, Emerald Isle has a beautiful new XC field and there’s also Water’s Edge in, IRRC, Concord? I am 30m outside of Boston (very close to Scarlet Hill) and in the summer there is no shortage of places to go and school. Really. I ship out every weekend in the summer (or try to, anyway) and there’s lots of places to XC school here.
VAeventer is right that there are not a lot of event barns in RI - Flatlands is in MA (Rehoboth) right on the border. I actually can’t think of a single event in RI either, I am in Area I and grew up here… There must be at least one.
There are lots of good dressage barns around here too - I like Elysium Farm in Harvard the most, there is also Settlement Farm in Townsend, there’s Highlands in Berlin (which has a GORGEOUS indoor), and quite a few others.
The price will shock you. Be prepared for $1000+ (at minimum) for full board at a decent facility in/around Boston. If you’re buying… you might want to consider renting a place as it is VERY expensive in this area. For a small farmette that cost you $300,000 in KY, expect it to be $1.5 million here.
If your husband is ok with a commute look in Western MA or even some parts of RI - the price drops SIGNIFICANTLY once you get past the satellite cities around Boston… I watched a farm in North Adams MA that had 100+ acres go for absolute pennies (IIRC, $280,000) and just wished we had the money – but the commute would suck!