The teachers may be able to convince the students fast. That may be the reason these students will be the starting all the programs like that. Instead of children if they ask other people they may not participate so actively because they will have their own works and commitments. The office managers may not leave the employees to waste their productive time for these good causes. So participation will not be as expected. When you invite the children to start their teachers will have to follow them as there will not be anyone in the school to teach. If teachers are also accompanying them there will not be any risk to students as the teachers will take care of them. One day, if the student is not hearing the classes or teacher, is not teaching the classes no serious loss will be there. The parents also will not object as it makes no difference to them, Probably because of these reasons they may students to participate first.