We seem to have had a large number of recordings in English from what sounds like a booth at some kind of trade show or event.
I am rejecting >99% of the clips because of background voices. I am letting a few clips through where there is a general hubbub of voices but where no individual background speech can be discerned. The problem is that in a lot of clips you can hear people explaining to other people what Common Voice is, so it seems like people are recording right next to where people are asking questions.
So if anyone is thinking of fielding contributions at a busy event, background noise needs to be considered if you want your contributions to make a difference. There should be some effort to physically separate the recording area from other areas of the booth if possible and also try to filter background noise as much as possible.
One way to improve this is to choose a microphone with a narrower recording field. An omnidirectional mic will record in 360 degrees so is more likely to pick up background noise, whereas a cardioid mic only picks up sounds at the front and tapers off at the sides/back (ideally choose a super/hypercardioid which has a tighter recording field).
Another thing to consider would be some kind of sound-proofing. The best solution would be an isolation booth, but this would be expensive (although they can be rented instead of purchased).
A more realistic solution would be to use shielding just around the microphone itself and such shields are pretty inexpensive.