A violent transition of power is messy, costly and unpredictable. A peaceful transition of power symbolizes that while we may not always agree with the person that takes office or favor them, we recognize that they were elected by the same Democratic processes that would work to our benefit in other cases. A peaceful transition of power is an indicator that the government is stable and can function.
A peaceful transition of power, one that America has had for the last 240 years, is nearly unheard of in terms of world history.
I think it would be right to peacefully assemble because we mostly know the first amendment is right to speech, religion, etc., but with the right to speech you could peacefully "speak" your opinion.