Baltimore Showspace tumblr account. You might have to do some research on the bands themselves but fliers for a lot of smaller shows that are more likely to have punk and ska bands on them are in there.

https://baltshowplace.tumblr.com/

Try Zen West I think that venue has some shows coming up and of not the Ottobar or Baltimore Soundstage should.

Try the app Bandsintown

Feed the Scene books ska shows around here, Transcendent Events books pop punk, both worth checking out for your purpose. Others have mentioned BaltShowPlace, that's the only real resource for show listings around here.

My neighbor is in a local ska band called the Scotch Bonnets

Higher Education is a Baltimore-based band that is always playing shows around here!

Only one I saw in January is Ballyhoo

The local ska punk band Stacked Like Pancakes may be playing some shows this winter. Not positive though. Might be work checking out their social media to see.

Just do a Google search of ska/punk bands touring in Baltimore

If you're willing to drive places in DC or Nova might be better situated