What should I do if the tour happens to encounter moderate rain? It's for zhapo.

Actually, you don't have to worry too much. It seldom rains all the time in zhapo. It should be intermittent, and moderate rain should have no effect on your trip to zhapo. I went last two weeks, and the weather forecast said it was from heavy rain to heavy rain. It was raining at home, so I drove all the way. It rained in many places on the road, but in zhapo, the sun was unusually fierce (but it was not very strong the next day, and it rained heavily)