The proper thing to do is for the president to call the meeting in question to order at the proper day and time, and any members present may adopt a motion to Fix the Time to Which to Adjourn (RONR §22). The motion would specify the date and time of the adjourned meeting and it must be held before your next regular meeting. So if your department wants to push it back until the same date at 9 PM for example, fine. A week later, as an example, fine. Just let everyone know, if possible. A quorum need not be present to adopt this motion.