Churchill spoke at UA in September 2004
In the midst of UA professor Robert A. Williams' resignation from the committee investigating the academic integrity of CU professor Ward Churchill, an archived version of the Indigenous Peoples Law and Policy Program news page (under UA's Rogers College of Law) reveals that Ward Churchill spoke at the University of Arizona on September 2 and 3 of 2004.
This comes in addition to current claims that Williams praised Churchill's scholarship. The claim is sourced at a page on CensoringThought.org, which appears to have gained the quote from elsewhere without citation.
Update I: PirateBallerina, the leading anti-Churchill blog which broke the Williams connection, has kindly linked to the Factor. He reports that Williams is the co-chair of the IPLP (the dept. that invited Churchill last year), but I rechecked Williams' page. According to it, he's the director of the IPLP. I've emailed PirateBallerina about it, so stand by.
Update II: PirateBallerina pointed out to me via email that Williams was co-chair at the time of the Churchill invitation according to an archived page on the IPLP website. Keep checking his blog in the meantime; we could see more resignations soon.