The act of networking is not so common in France. It is perhaps related to the fact that French employees usually stay for a long period in the same company, so they don’t feel the need to extend their network.
It can be challenging to arrive in California and hear that it is not only what you know that matters but more who you know.
I understand that it is helpful to develop your network, but my preference goes for quality rather than quantity in terms of connections.
I remember a person I met at a networking event. She was very good at exchanging business cards while going from one person to another, but I don’t think her name will come first to my mind if I need services similar to what she offers.
This person contacted me twice: the first time was few days after we met, and the second time was two or three months later. Both times, the same scenario happened: she sent me an email to suggest that we meet for a coffee, and she would finish her message by asking if I knew companies looking for contractors. My answer was the same both times: I suggested a place and date to discuss and told her I was not aware of current openings or positions. We never met because she never replied back to my messages.
Adding a new connection to your network is one thing, but maintaining the link and building trust is another story.
Usually people already have an idea of the persons they want to work with when they have a new project, so do not wait until the last minute to build a sustainable network.