Ask yourself why hackerspace SG is closed except the time when ppl request to drop by so one of you need to be available so that he/she can open it to let that person in. Why? Cannot be open for 12 hours? So that the public can drop in anytime. Why the public need to message icedwater or valentine privately to inform them everytime they want to drop in by?
If it goes on like that, the public loses interest to drop in by if need to message to inform them everytime they want to drop in by.