Could you get a few families together for field trips with you? 15-20 people would be a good size, then call ahead and make arrangements.
Also check:
any area performance theaters for any daytime school performances at the student rate museums
festivals
historic reenactments
airport
local radio or tv station
city hall/mayor’s office
fairs with farm animals, art, etc exhibits
local lake, state or national park, or wildlife refuge visitors center (check for events too)
small businesses
Also great tv field trips are on episodes of Mister Rogers. Some are free on pbskids.org and many more are on Amazon Prime. Great character training for these ages too. See making dolls, combs, sweaters, musical instruments, books, toys, and many more. Go places like Colonial Williamsburg, antique car show, farms, zoos, music & art performances, etc. without leaving the house. Highly recommend.