There is a local tradition in Switzerland, and some parts of eastern France and southern Germany where roads are given to cyclists for a "slow up". Cars are banned on the route. Tens of thousands of people are on the road, there are local festivities, music, food stands and drinks and it's a really good time for everybody.
Were they hiding from the photos or something?
There are lots of cyclists in the photos. We're you expecting them to all crowd together in one spot?