Yo! This is awesome thinking and I love seeing it here. For a while, I booked interpreters for meetings and events and my company, so it's something I'm somewhat familiar with.
We've looked into this in the past, and what the expected process seems to be is that the person needing an interpreter will contact the event or the venue ahead of time and request that one be arranged for. (This also helps us know if we need to book an ASL interpreter, an MCE interpreter, or some other kind, and to arrange anything else we might need to, like providing a list of specialized vocabulary.) That way, the interpreter can also go to panels and events where we know the people needing the interpreter will be.
Are there folks on your panel or who you know are coming who need an interpreter? We'd love to work with them if that's the case.