group tour provided by China tourism board at north gate of the summer palace?

Hi, I am confused by what you said. But if you want to have a Summer Palace tour under the guidence of the tour guide, maybe you can join in a local travel agency.
If you don't mind, I had a three-day tour in Beijing in July and turned to TravelChinaGuide. They provided me with a good service, including Summer Palace tour.
Maybe you can contact them.
Here is their e-mail: travelchinaguide.com|tours
May you have a nice trip!