I don't know it the chance to hold another event will occur anytime soon but it seems the new system would suit it well.

The "snowball" steam event led hordes of players to the game to play T1 Lockdown. These new players were mercilessly slaughtered by experienced players from my personal observations. I do not know what the retention level of these players was but "feel" that if an event was worked into the new system that retention would be much higher based on my initial impression of the update. Perhaps an event that would require reaching a certain mission would be enough. The new system seems to do a better job of introducing the game to a new player. Excellent work on the update.