Here is some information on the local hotels (Captured from the MIR website).

Best Western of LaPlata (this is where we get a group rate)
6900 Crain Highway # 301
LaPlata, MD 20646-5933
(301) 934-4900

Holiday Inn of Waldorf
1 St. Patrick Drive
Waldorf, MD 20603
(301) 843-3350
This e-mail address is being protected from spambots, you need JavaScript enabled to view it

Sleep Inn & Suites by Choice Hotels
23428 Three Notch Road
California, MD  20619
301-737-0000
1-800-4CHOICE