Checking avails means pulling up every open date across every venue and room without leaving the hold you are working on. One view shows what is free and what is already booked, so you can answer a promoter's date question on the call instead of after it.
For multi-venue and multi-room operators, this replaces the back-and-forth of checking separate calendars or texting another manager. If the venue you need is not on your calendar yet, you add it inline and keep placing the hold without starting over.