You don't need to sign up for a visit, but you can visit Tsinghua for free. Due to the large number of visitors in winter and summer vacations, visitors need to queue up to register before entering the campus for safety reasons. At that time, you and students can queue up to register with valid documents (ID card, student ID card). You can hire your own tour guide or visit for free, and there are souvenir shops on campus that can be purchased for free. I suggest that you hire a tour guide to let students know the culture and spirit of these two universities well, which is of great educational significance to them and encourages them to make progress.
You should pay attention to the following points:
1. Don't buy souvenirs, hire a tour guide, and it won't cost you anything (of course, eating and drinking is your own business).
If you want to hire a tour guide, please find a regular travel company. There are many black guides around the school.
Many people come to visit during the holiday. Go early to avoid queuing (9~ 10 people arrive), and you can visit two schools a day.
It seems that at 5 pm, people outside the school are not allowed to enter the campus.