A unit plans to organize trade union activities to visit the nearby ancient town. It needs to count the number of participants. Xiao Chen said: if it doesn't rain, I have no reason not to go. Xiao Wang said: January 1 is my child's birthday, and I must accompany him at home. As long as it doesn't happen on this day, I can't go. Xiao Liu said: if it rains, I won't go. Xiao Zhang said: if someone goes, I will go. December 29 On Tuesday, the person in charge of the trade union informed that the trade union activity was scheduled for the day after tomorrow. I hope everyone can make arrangements, and the weather forecast says it is impossible to rain this week.
leads to:
 Xiao Chen, Xiao Liu ,Xiao Wang and Xiao Zhang are sure to go