Visitors who bring laptops with wireless cards can use the eduroam network, or request a temporary wireless account from UNL. For the latter option, just connect to the UNL-Guest network, open a browser, and follow the directions.
On the registration page you can indicate that you will be driving to the conference and the organizers will obtain parking passes for a lot near both the hotel and campus. Additionally, there is a parking garage on the UNL campus, one block from Avery Hall, that typically is free on weekends (or $1.25/hr up to $7/day, if not free). No overnight parking is permitted in the garage.
Here is a map of UNL city campus with Avery Hall marked.
There are many restaurants within walking distance in the downtown area for lunch and dinner as well as the Nebraska Union. A list of restaurants will be available at the registration desk.