Weekend event. Aliens strikes back to take over mothership.
All alliances involved to get a global goal.
1. Aliens spawing with a higher rate then normal alien events.
2. Everyone needs to shoot aliens to reach the global goal, there is a global kill counter.
3. The counter, for example, we all need shoot together, the whole region, 5000 aliens in the weekend.
4. When the 5000 kills are not reached, the mothership will be gone for 7 days, all titles revoked, all control points revoked. After 7 days, the motherships lands and needs to be controlled again.
5. Event leaderboard score is alliance amount of alien kills.
I hope you will implement this. It looks nice and fits in the game style.
* 5000 is just example number. But it must not be a easy to do event. make it a hard one.