This has been tested with a new, un-modded file and the result is the same. If you start an event or invite a club to any community with small walking areas or DJ booths, they immediately begin sharing slots and walking through objects which the group is attracted to.
in the last test, upon arrival, three immediately stood on top of each other:
http://s13.postimg.org/h249jkb53/01_24_16_10_26_32_PM.png
then one walked through the DJ booth and began cheering:
http://s13.postimg.org/ayi3lwvhj/01_24_16_10_26_54_PM.png
This test was performed with an entry level club (6 members) + the maximum number of visitors who were invited by phone. With larger clubs, participants will stand face-to-face with the DJ and as many as five sims may occupy a single slot. Again, no mods, scripts, or custom content was installed.