Increasing Performance for Events

I dont know if its even possible but after attending both Terror Town events this week, I have noticed that there is a huge performance hit causing people to appear an default dannies (yes I know that happens in large groups, seen it before), voice issues with people hearing and not hearing others and appearing invisible for others.

I dont know if there is a way to increase the server performance somehow but it would be nice to have to experience these issues at events.