ANY rate is for ANY time or ANY way YOU WANT TO USE IT
If you are not full, why would anyone turn down someone on a weekend when they ask for a govt or other rate.? All rates are "subject to availability" and you
I take the case: I love Inns free night cert - so many guests tell me horror stories and I know because I have even called on their behalf ...
Let's say restrictions are Sun-Thu only, on 2 occassions I called an Inn with around 13 rooms, and I called a few days (not weeks) in advance and they are NOT an Inn that gets full at the last minute. They had ONE or two rooms occupied ONLY. Guest wanted to use free night Sat and Sun nights. Innkeeper says No. I mean the Sunday was part of the Sun-Thu AND they had availability!! and it was a last minute res. Geez. I would rather have the revenue than turn away the booking. *Then there were the Inns that never even had the decency to return my calls ....
The other option is to say "I am sorry the government rate is for offificial business travel (and who says some govt people don't work on weekends anyway??) but I can offer you (alternate discount - last minute? multi night? AAA?)
In the same vein if your govt rate is single and they are traveling with spouse why not just upcharge the extra person?
I am NOT criticizing policies I am just saying unless you are running full or don't need the business why would you NOT take the biz?.