解析：
Key Points:
Problem:
The girl is going to hold a spring concert tomorrow evening, but the forecast says that it might rain tomorrow.
Solution 1： Change the location to the auditorium
Comment: But it will be more popular and livelier if the concert is held outside.
Solution 2: She can change the time to the day after tomorrow.
Comment: But she is worried that there won’t be too many people coming around on Sunday.