A Request for Proposals (RFP) from the Minnesota Department of Commerce is a formal invitation to potential contractors or grantees to submit a proposal. Pre-letting (how to bid). Steps.Submit your bid prior to the bid end date. Once the date and time passes, the bid will disappear. A listing of requests for proposals (RFPs) from League of Minnesota Cities member cities seeking expertise and services from vendors. Find RFP searches and finds website design bids, contracts, and request for proposals. Complete this form and return it with your bid or proposal. Proposals are accepted until all funds are committed.