Weekend Plans vs the Need for Nothingness

The August weekends have been booked up with plans. It's mostly social stuff - getting together with friends, celebrating people's birthdays, a sleepover, a trip to the mall with H's friend group. I am slightly concerned that I am going to feel completely run down and burnt out by the end of the month. 

I've been really enjoying getting together with people and catching up o with friends that I haven't seen for months. I've really enjoyed getting to know new people and having interesting discussions. Being with people can be energizing. However... I also crave quiet and solitude, because that's what I need to re-charge and keep my sanity.

The balance of doing lots of things and doing nothing has been difficult. I find that I really need both - I am just not sure how much of each! 

How do you balance the need to be alone with the need to see friends?