Simply avoid areas with large noisy gatherings of above 10 people. Surely it is not difficult to spot trouble and walk away? I spent time in France and when most other people appear to be rushing in the direction opposite to me, I would be alert to check what is ahead. When there are suddenly police vehicles, you have to be alert too.
Paris is not shutting down. People still go about their own business. Tourists still visit. Conferences are still held.