I wish have a module about "Recent Events" to show recent activities in several locations:
calculate the latest events holding on each location right row.
like:
Recent time: 18:28
Location 1 >> Seminar 16:00 - 18:30
Location 2 >> Not in use.
Location 3 >> Group Meeting 18:00 - 19:00
And infos update by page reload is quite enough.