Change the map rotation in custom server would be good because people have to always play start from left 4 mario, kinda hard to reach the other maps mainly the new maps after last update in custom server like, 2019, white forest, and indiana jones. Not bad to put Left 4 Mario as the first map due it's one of the most popular custom map in community, but I still recommend to replace it with other map.. or change rotation from the 2nd map, which currently is military industrial, then daybreak. Most people 'give up' after the daybreak map. After people leave, the map reset to left 4 mario again, then military industrial, and daybreak again. So some people have been played few of the first maps like bunch of times (include me) and start to getting bored with it. A little bit about event, when there is a plan for next event make it in custom server would be good, so all the players will download the maps and they wont have trouble again to join the server next time even the event has ended. Which is one of the main reasons people not join custom server, because they want but don't have the maps. Event in VS/HI server is not bad as well, at least not in normal coop.