Today (July 17) Mackenzie River Pizza will partner with local law enforcement agencies to host "Tip-A-Cop".  This annual fundraising event involves local law enforcement officers volunteering their time as celebrity servers in an effort to earn "tips" for Special Olympics Montana Athletes.  All proceeds derived from these tips are provided directly to local and state-wide Special Olympic Montana athletes.  Today's event is at both Billings locations from 11 am to close.