I think you just did. Also, in the menu here, under "More" there are Member Homepages, which are searchable in various ways. Searching for "Baltimore" just yielded 23 results. You could then contact anyone who interests you.
Try the suggestion above if you want to go through the Fiddle Hangout platform.
Otherwise, I’d recommend getting involved with Friends of Old Time Banjo. There are more fiddlers than players of all other instruments combined in that group, and the majority of the members are in Maryland.
Under normal circumstances, Baltimore Old Time Jam. Normally they meet twice a month. Now their leaders lead a virtual jam on Facebook and Youtube every other Tuesday night. Look up the jam on Facebook.