Some already started. Others will be conducted later this week.
Some ACC teams play the opening rounds on their own campuses, games that have no impact on who makes it to the championship rounds. Others play every game at a neutral site.
Some pre-determine most, if not all, of the matchups. Others allow wins and losses to scramble the field.
Some schedule games on consecutive days. Others employ separate dates, separate weeks, and multiple locales.
Some play at exotic neutral sites. Others, not so much.
In-season fall tournaments are not only a fixture in college basketball, but have become quite ubiquitous.