I have been to the Big E many times. I grew up in Mass. and as a kid we went every year. Since moving to RI I've only been maybe a half-dozen times.
I think its alot of fun, for kids and adults. There is as mentioned a building representing each New England State, very informative and fun too. Theres a 3-ring circus, the usual farm animals on display, all the typical fair stuff. They have a horse show (no idea how to spell it, Lipizon?), the budweiser horses have been there. Joey Chitwoods Thrill Show (car stunts), a parade everyday. There's always a band/singer, usually well known ones, but my memory is not so hot, I asked hubby who we've seen perform at the Big E and he said Barbie Benton (and added: big boobs), Lynn Anderson.... these were back in the 80's I guess, He couldn't think of any recent ones, he's old too, lol. You'll see wood cutting shows, 4H always has something, and theres a circus display.
All the above mentioned shows/displays are included in the admission price. There are rides that cost extra, we never go on the rides for 2 reasons, 1) the cost 2) you can go on rides anytime, we'd rather see the fair stuff.
And food!! Oh my gosh... you can buy all kinds of food! The main fair ground has the regular fair items and in each state display you can buy food from that state, ie: clam chowder from RI, maple products from VT.
I know I'm leaving out lots of things and probably not doing it justice. I would advise getting there early. And wear good walking shoes, the place is huge.
If you like fairs in general I'd say go!! This is a huge fair, plus entertainment. I think you'll have a great time!!
Check out the site Maddy posted... lots of info. there.