We took DD to Burke Nursery's fall market a couple of years ago when she was 2 and had a great time. Unfortunately their website doesn't give a lot of info about it but they have a pretty sizable play area onsite and a nice market. You can see a few pictures here:
https://www.burkenursery.com/home/third-annual-fall-festival-and-pumpkin-playground-photo-contest.html
https://our-kids.com/fall-festival-pumpkin-playground/
It's not such a madhouse as the bigger places like Cox Farms (I love Cox Farms but it can get SO crowded it's overwhelming, at least to me, and definitely to DD when she was 2).