Below is a list of resources for when you bring guests to the lab or need to set up resources for guest speakers, collaborators, etc.
Guest Wireless Access
The Office of Information Technology allows staff, faculty, and students (I think) to create a limited number of guest accounts for a brief time period via their online services page. You can access it description of the service here: Guest Wireless Access
The identity management page is here: Special Identity Management System. Select "wireless" from the dropdown "System" box, and it should take you through the steps necessary to request an account.
Requests seem to be automated and are handled pretty rapidly from my experience.