The only event we (the Stack Exchange Team) apply the term "Town Hall Chat" is just prior to a Moderator election where community members can ask the candidates questions. We're still quite a ways off until you graduate and have a general election.
First we have to find you guys some temporary, provisional moderators. There's been too few nominations coming from the community and way too many nominees declining to get even a temporary moderator staff up and running for this site.
See Moderator Pro Tem Nominations.
Having said that…
This is your meta forum and your place to organize your site's governance. If you feel there are issues that can be solved by real-time collaborations, our internal chat rooms are a great place to hold such events. Call them Town Halls or whatever you wish, but these types of organized events are a great way to increase engagement and get things done.