Brand brief is like a job description. Just define your needs, post it and be visible to multiple events.
Using intuitive search bar, sponsor screens events with audience/other parmenters.
After a quik evaluation of search results, sponsor shortlists and contacts the best fitting event(s)
Events view your brand brief(s), and apply to it. They even answer any specific questions which you may have asked shortlist/reject an application in a matter of seconds.