I live near Nice, but wasn't out yesterday night.
I was the previous night, some towns celebrate national day one day before to not conflict with near towns events, like fireworks at the same time or less people at each event.
All nights in summer, in many Mediterranean towns there are a lot of musical events, live and open air concerts around the streets. lot of people gather, I hope they won't cancel all of them. Falling in fear is what such groups hope.
edit:
They decreeted three days of National mourning, and canceled Rihanna concert and Nice Jazz festival.
I understand it's a mourning time, but canceling festivities will not prevent more attacks. people who reserved planes and hotel for the concert won't get their money back.