I volunteered a lot when my grandchildren were in grade school. They were glad to see Grandma on the playground or checking off accomplishmen's in clubs. I went on field trips. I was a PTA officer.
My granddaughter is starting her sophomore year. I have not been involved at all in any of those activies since she started high school. When she was a freshman, she was in Dance Club. Parents were expected to help with transportation and fund raising. We helped in having the occasional potluck. I volunteered every chance I could.
Her sophomore year, she was in chorus. Parents provided transportation when it was needed, provided uniform clothing, attended concerts. Helped with raising funds. That's it.
She now goes to an alternative school. School encourages parents to be involved in following their student's academic progress. That's it.
Kids are pulling away from parents in high school. They are learning how to be independent. They are interested in learning ways to live that are different than the way they lived as younger kids. They have support from friends and unrelated adults. Both my daughter and granddaughter rarely wanted my advice. We continued to have conversationsin which I listened much more than talked. I learned to guide them by asking questions.
I suggest that your son needs to test his wings. If he's still clinging to you a month or so after the start of school, he needs to be gently pushed/encouraged to branch out more on his own.
Now that I have read several posts asking how you can help your son, I strongly urge you to start letting him make his own decisions about what he wants to do. Give him information when he asks for it. Then tell him that many things, including his social life, are things for him to decide.
I suggest that if you try to be directly involved with your son in high school he will be teased as a mama's boy. Continue to monitor, to be encouraging, let him learn how to make friends.
Sounded like he had friends and participated in activities at camp. He can do this without direct involvement from you.
In one of your posts, you said you were beginning to think about life after your son leaves home. I suggest that you start focusing on ways to live your life separate from him. Think about ways he can help himself. Time will continue to fly by. Your son has to learn independence to be a successful adult.
I know how difficult this can be. I learned a lot while parenting my daughter that is helping me parent my granddaughter differently. I am the Grandma who is always there. I'm also the Grandma who consciously let's go of always being in charge of her life.