Excuse my harsh tone, but, tough luck. Deal with it.
This is an NA server, hosted in NA, for NA players, this is not an EU server. This is not some kind of universal english speaking server, EU players are playing from outside of the intended region and there is absolutely 0 reason event times should cater to their schedule at the expense of the players actually playing from within the intended region. There's nothing wrong with playing from outside north america, but expecting the NA server to be changed to better fit your schedule is a ridiculous notion.
If you don't like the timing, play on RU, if you'd like to understand the chat, play on NA and simply learn to deal with the high ping and the inconvenient event timing because that's the kind of stuff you should expect when playing cross-region.
Besides, I don't see any sources for this 50% population claim, so I can only assume the information is coming out of somebody's behind.