You are talking about a past event. Even though it is cancelled and postponed, it is still in the past nonetheless. Since you are talking about the event that was suppose to happen on May 27th, you should use was interesting. However if you are talking about the SpaceX Demo-2 without a date, you can say: The whole thing is interesting overall" or "The whole thing is interesting in general". You have to consider the fluidity of the language. The usage of certain words could change with the context.
tamuno
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