@Nicole2640
A special offer is created by using the "special offer" form, which does not apply minimum stays.
The guest need to sent an inquiry ("contact host") for 2 nights, after that you can sent the offer for 1 night using the "special offer" button. (If the guest already sent a booking request, then first ask the guest to retract it and then sent special offer).
You can also set the minimum stay for the specific date to 1 night (custom length of stay), but then there is a risk somebody else going to book it.