It looks like Microsoft added some additional options for creating new meeting types from the Microsoft Teams calendar. You can now create a Webinar or Town Hall meeting directly from the calendar there. Here’s how that looks…
When you are in the Teams calendar, click on the New drop down menu where you will see the meeting types. In addition to Event and Channel meeting, you can now also schedule a Webinar or a Town Hall from here:

Just another way to allow you to stay in context with where you are working…