I was at the DC MBA Tour yesterday.
*Who are typically in attendance from the schools?
Admissions staff.
*What is the format of the MBA fair?
Yesterday it was:
9am check-in / registration
930-1015 intro panel, how does admissions make their decisions
1025 - 2pm school info sessions
2-4 mba fair (schools at booths etc)
*What should one take to the event (e.g., resume)?
The schools didn't seem to be taking resumes. They kept track of who came to their presentations and who they talked to. They did not take any resumes, and they were not evaluating the attendees in any way.
*Any other thoughts or tips to make the most out of it?
Figure out which schools are attending and which schools you're interesting in talking to. Research the schools in advance, and know what questions (if any) you want to get answered.
It's really a no-pressure environment to learn more about the process and the schools you are interested in. Pretty much everyone wore suits and had a leather binder for notes and such.
There were also test-prep companies and admissions consultants, pitching their services.