Someone deciding whether to get in touch will not read your page thoroughly. They will scan it, form an impression, and either message you or move on. That is not laziness — it is what anyone does when working through options. A good listing is built for that scan.
Anyone looking at an entertainment listing is trying to answer four things. If your page answers them above the fold, you have done most of the work:
A listing without audio asks the reader to take your word for it. One good clip does more than several paragraphs of description. It does not need to be a studio recording — it needs to be representative and not unpleasant to listen to.
A picture taken mid-performance, in a room, tells a booker more than a posed portrait. If you only have one usable image, make it that one.
Upcoming dates do two things at once: they show you are active, and they save a booker asking whether you are free. An empty calendar is not fatal, but a current one answers a question before it is asked.
Write the short description for someone who has never heard of you and has four other tabs open. Everything else on the page can be for the people who are already interested.
Full biographies, influences, the story of how the band formed — none of that is wasted, but none of it belongs first. Put it further down for the reader who has already decided they are interested.
Worth doing before you fill yours in: look at how other entertainers near you present themselves, and notice which pages tell you those four things quickly. Nothing on a BandstandHUB page is public until you publish it yourself, so there is no rush to get it right in one sitting — start one and build it up.