There is a community of motorbike owners in Lyon. They have popped up unexpectedly twice in the last weeks. The latest time was in Place Bellecour on Saturday evening.
I managed to capture a little footage of the gathering; the resulting film is below and available on YouTube in High Definition.
The crowds do not appear to be phased by the motorbikes weaving between them. Of course, the average Lyon resident seems not to be concerned about walking amongst traffic in general.