When attending a weekly meeting we're stuck in either a step or begineer meeting. Sometimes a discussion.
But at conventions there is usually a choice of 3 meetings to attend at the same time.
Meetings are intended to be the bedrock of recovery. It's where you learn about the steps, get a sponsor, take up service commitments, et cetera.
Conventions are intended to build upone what you've got in a foundation. They're also generally expensive. That's why they're about 1x or so a year.