If a scheduled event is delayed, it takes longer than anticipated for it to start, but it still takes place without a rescheduling.
If a scheduled event is postponed, it is canceled for the time originally scheduled, and it is rescheduled to take place at a later date.
Suspend
If you suspend something, you delay it or stop it from happening for a while or until a decision is made about it.
A UN official said aid programs will be suspended until there's adequate protection for relief convoys.
Suppose you go to a concert. If it is delayed, you will continue to sit in your seat and wait for the concert to begin. If it is postponed, you will leave the concert hall and return on the day it is rescheduled.