Yeah I get that. What i mean though is this:
Server 1:
Within 4 days can acquire 1m balloons. 100% needs 800k donated.
Server 2:
Within 4 days can acquire 2m balloons. 100% needs 800k donated.
Server 3:
Within 4 days can acquire 5m balloons. 100% needs 800k donated.
If server 2 rushes to get 100% then they might be able to donate 800k within 2 days.
If server 3 tries to get as many balloons as possible for the full 4 days then at the last minute on the 4th day donates 800k then will have 4.2m balloons ready to donate in phase 2.
Server 2 will then have rushed themselves out of collecting a further 1.2m balloons.
Its the second phase that is really the event, not the first. The first is to just qualify for it.