During the terrorist invasion, Yuri Kerzach grabbed a laptop from the presentation hall. Based on his observations, he noted that a presentation must have been going on before the attack. (Darwin's Soldiers (GOF RP))
Other versions[]
In anti-matter Pelvanida, the presentation hall became the headquarters of the terrorist attack, much like the hangar was in the matter universe. It was evacuated to the sublevels in preparation of the Einstein-Rosen bridge's arrival. (Ground One)