Douglas County commissioners are expected to vote tonight on proposed rental rates at the fairgrounds, 21st and Harper streets.

The proposal would double some rental rates and leave others unchanged.

A few months ago, commissioners asked for a rate schedule that would allow the county to collect 50 percent of the fairgrounds’ operating costs over a three-year period.

If approved, the first phase of the fee changes will go into effect this year. They will not, however, affect events that already have been scheduled. Events involving 4-H and recognized youth organizations will remain exempt from the fees.

Before voting, commissioners will give the public a chance to comment on the rate proposal. The meeting starts at 6:30 p.m. on the second floor of the Douglas County Courthouse, 11th and Massachusetts streets.