The way I've chosen to answer that, at this point anyway, is that some events have broader implications on or stronger interrelationships with the rest of the Bible than others. Some events are also more pivotal in the development of God's purposes and with mankind.
So just for fun, here are my top ten (chronological order), with limited explanation. I'll save the supporting arguments for when y'all start shooting back.
- Establishment and reiteration of the Abrahamic Covenant
- Establishment of the Davidic Covenant
- Incarnation of Christ
- Death and resurrection of Christ (I realize I'm cheating pretty badly here so I don't have to cut elsewhere.)
- Second coming/final judgment/New Heavens & New Earth (Cheating again, though it wouldn't be quite so egregious if I were Amillennial.)