Very often when people plan tournaments or other mechanically inclined events it turns into a massive lagfest for the whole server.
A recent one in Sib saw it taking upwards of a minute to drink one potion, making things painful both there and on Skal.
I'm aware that as a twenty year old game only so much can be done. But I think if the actual arena's were moved to a separate server (new or lower pop existing) it would help both event planners and people just trying to enjoy their time that aren't attending the event.
I know in the past devs have declined to move sailing to its own server, favoring some changes to make sailing less laggy. But Im not certain there is anyway to make tournament events less laggy if they have more than 30 people attending in addition to other people usually on the server.