This was supposed to be quite a long post, but I'll summarize my view of the event..
Lack of control in holdings, some aircrafts hold for two to four hours, others for no time at all. No information on expected hold time, and ATC did not care about how much fuel they had onboard. One to Two hours of holding is ok, but four hours of holding without any information?
Denying diversions, and asking diversions to disconnect?? After two hours in holding, I got asked to disconnect when I wanted to divert to Oslo. Why and after which rule in VATSIM?
Similar callsigns, and obviously bad voice servers. This is not your fault. What will allways be a challenge on events like this is people not paying attention, mixing up callsigns, stepping on eachother and beeing impatient. However, instead of spamming people with contact me messages, maybe try to contact them on frequency.
Corelations, maybe during events like this, do not use realistic mode? Seemed like an issue.
Runway Configuration: Why is it that during the real ops and this event, the Off Peak config is used?? Seems like the least effective approach as well?