In general, any collective wishing to use the ballroom, the disco room, and other common spaces should submit an event request at
https://omnicommons.org/occupy - the calendar is buggy as heck, and I for one don't have the time to check it. So best method is to coordinate use of common space with the
Commons Working Group - which could hella use more volunteers, btw - for use of the common space. This is best done by consolidating calendar events by putting it on the calendar with the aforementioned link.