Representatives from Foxwoods Resort Casino, which has joined with developer David Nunes to propose an $850 million gambling casino off Interstate 495 in Milford, will present plans for the destination resort to the Board of Selectmen on Monday night. The meeting starts at 7 p.m. in Town Hall. The proposal is one of three competing for the single full casino license to be issued in Eastern Massachusetts. In addition to securing the license from the state Gaming Commission, the proposal would need support from the Board of Selectmen and approval by Milford voters in a townwide election. Casino-Free Milford, a local group that has been working to defeat the proposal, is asking members to attend the meeting wearing red to “respectfully” show selectmen and developers their opposition to the plans.