Since we have 2 guilds (Mosaic - Pub // Dark Mosaic - Imp), It all varies on which side players decide to play on. We don' t really have players who are dedicated to one side over the other. For nights and weekends, this also depends on which month each side is running guild events on. What I mean by that is January is our Pub month where all the guild events are being run within Mosaic and then February, we will be running guild events with Dark Mosaic.
Where some guilds have it set where you need to log in x amount of time in-game and participate in x amount of events or you are not wanted, we do not have this. With mosaic being a casual guild, you will never be expected to log in for any amount of time or be on for certain days/nights.