Students who come to play in different places have a good relationship with you if they can contact you. They haven't seen each other for years, so it's natural to make good arrangements. After meeting your classmates, you can of course talk about each other's life for so many years, your cities, your work and your contact with other classmates.
After talking, it is natural to arrange accommodation and transportation for a few days. If family conditions permit, students can be arranged to stay at home. If the family conditions do not allow, you can arrange for your classmates to stay in a suitable hotel, and then introduce the local characteristics to your classmates to see which scenic spots they want to visit. Some students have goals and can go straight to their destinations. If your classmates don't have a clear goal, you can recommend some interesting places, and then.
The students who come to visit you may be on business, may be for meetings or training, and some may come on purpose. Of course, some of them have arrived, but they missed the meeting because they didn't have enough time or didn't know you were here. When you entertain your classmates, the most likely thing is that you will go to the same scenic spot many times, because you have to take them to play every time. But no matter how many times you go, you are happy.
It takes some financial expenses to entertain classmates, but you don't need to worry about it. Because of reciprocity, you may also go to his city, and your classmates will scramble to pay the bill or buy you some souvenirs, so play openly when you play, because it is really hard to meet.