Part of the reason for that is because UW is on quarters, not semesters, so our students just started classes last week. That timing makes it a bit more difficult to get info disseminated to our university community prior to the start of OA Week. So we're stretching out the time available for people to see the exhibit and putting in an area where people will almost stumble into it.
Harvard has had the same problem getting people (faculty) to attend events. Last year we invited people to a "faculty recognition" event where we highlighted about 50 faculty who deposited in our OA repository. The event was held at the campus pub and got some good attention. We are going to do this again this year. No speakers or presenters, just an informal gathering.
Hi Sue, I think we had 45 at one event (of four) last year, but that was because a library school faculty member brought his class to that particular session. 20-25 attendees was more the norm at each session over the last three years.
Speaking of "sticker shock," I'd like to bring up the fact that the shipping costs for the OA Week materials I wanted to order from SPARC came to twice as much what the actual cost of the materials are! (And thus made them unaffordable on my budget.) I'd really advocate strongly for different shipping costs for smaller, less expensive materials like stickers.