Hi Tammi,
Oh my goodness, there are a lot of resources for you. I totally understand how you feel. I'm newly single with a 5 year old, and it can be challenging sometimes to make play dates when other kids have families and the moms don't really have the same need to meet up.
I have some suggestions for you.
www.meetup.com - You can search on there for groups that are appealing to you. There are a lot of moms groups.
There is a wonderful meetup group in Burbank that plans tons of playdates and outings and activities. I know a lot of moms in the group have kids your son's age. Go to www.meetup.com and search in their for the burbank moms group.
Glendale College Parent Ed Mommy and Me classes - ###-###-####. This is a fantastic program where you'll be in a class where the kids are all the same age, and you'll get to interact and learn and share about parenting stuff. I met some of my now best friends in the program. I can't speak highly enough about it. The teachers are fabulous and it's a lot of fun and very supportive.
www.momsclub.com - I've never joined one of these, but I know a lot of people who have. The groups are created by area and meant to be very local for members. In Glendale, there are a few think, even split up by what part of Glendale.
I hope that helps. Really, I think the Burbank moms meetup group would be just what you're looking for. They have some many things to do and the group seems to really have their act together.
All the best!
M.