Helps to have some certainty but maybe peeps just too time poor atm. So no need to sign up for long term.
Maybe just an undertaking to open for the following week is enough for now. Then someone might decide that it's something they actually like doing and become semi-permanent.
Or pre-market opener could say they will do rest of the week etc. For example.
Once you do the open you realise it only needs to take one minute.