There are plenty here in the Placer area, don't worry about that! I think there are 2-3 people who live near me in Antelope that I know of.
You might have to reach out to the specific sections in the "firearms discussions" depending on the type of shoot you are doing. We are finding that a lot of people hang out in one section of the forum so if you want to do a handgun shoot post about it here and in the handgun section.
I say pick a shoot that sounds fun to you, pick a place and then a time/date and go for it, there will be plenty of people showing up for whatever you choose to do.
There is no shortage of people who want to hang out and shoot that's for sure!