New Events Module
Design and Skin Customization
I don't think that we'll be updating the Event module to do this as your requirements are pretty specific and its JR policy to keep modules as 'general purpose' as possible. However, maybe you'd like to 'sponsor' the development of a module to work with the event module to achieve this functionality?
My understanding is that you want to specify the Artist and Venue quotas, then add 'live search' fields to the Event forms to select profiles from these quotas? A module to do this would be fairly straightforward to develop. Please confirm that this is what is needed, and specify any other requirements so that we can discuss this further.