Check out the patch notes for the v19 Winter Mischief update here: http://maplestory2.nexon.net/en/news/article/55464/winter-mischief-v19
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It was there to begin with. This is straight from the launch patch notes:
"The "Server" button in the character selection screen has been removed due to a technical error when switching servers. In order to switch servers, you will now need to restart your client in order to view the Regions."
I'm sure they'll re-add the button when/if they're able to fix the issue.
i suppose a lot of people happen to be in that timezone, and there's also this snippet from the roadtrip page:
"Nexon America's computers will be the official time-keeping devices. All dates and times in Pacific Time."
i'm not sure why they chose that time exactly, but it'll definitely be up then as it's been announced everywhere including the official discord and the previous events have also gone up at that time.