The memorial was 2 weeks after moment, so everyone would stay calm, especially when the whole world is watching you
Who knows maybe they were prepared for this with doctors and meds. Who knows maybe Michael really d..d from cancer (I pray God he hadn't) and they were expecting this.
I've seen people after 2 weeks and they usually don't show crazy desperation - it's for first days and special dates. people usually stay indifferent - that's what we actually all saw that day.