Are there are small schools (under 10,000) in northeast who have marching bands?
In general, marching bands go along with major college (1-A) football. The set of major college football programs doesn’t overlap very much with schools under 10K or schools in the northeast. Boston College would be a smaller NE university with a band. In the South you’d have Wake Forest, Duke and Vandy. A lot of NEern schools will have “scramble” bands which are satires of marching bands. The “Mucho Macho Moo Cow Marching Band” at Williams (which incidentally, doesn’t march) is an example.
