After the sale takes place, the 10-day upset bid period begins. Filing an upset bid means placing a higher bid on the property.Bids are invited on the basis of a Single Prime Contract. The undersigned Bidder proposes and agrees, if this Bid is accepted, to enter into an. Your most frequently asked questions about the city's procurement process and how to do business with the City of Charlotte. Register to use the MECKProcure portal to monitor upcoming opportunities, bid on projects and manage your vendor profile. MeckProcure Guides for Vendors. All bidders must be registered with the Virginia Board of Contractors and hold a Class A. License.