The temporary after-effects of a tragedy big enough to attract public attention, whereby politicians talk on and on (and on and on...) about how people need to be more civil and respectful of each other, when everyone knows the new mindset is a temporary one.
Can also be used to describe what happens after a business aquisition when the CEO of the expanded company addresses the employees of the acquired firm and says 'we're all one big family', just before the layoff notices are sent.
Person 1: I think that due to (fill in tragedy here) people are going to think before they do or say something hurtful when they disagree.
Any arbitrarily taken holiday or unoficial vacation. Usually celebrated in schools but can be celebrated during any other event. The day consists of taking the day off from school, work, etc and just having fun.