There is an advert currently running on TV in which the voice over ends announcing ‘Always keep away from children.’ - I believe this to be very good advice.
Having ignored this advice, I offer this advice which I would strongly recommend you heed – safety of the children under your charge should be your number one priority.
Ensure that there are sufficient adults to oversee the activities of the children; make sure that they cannot wonder off unsupervised.
Should some injury befall any of the children under your charge, it is unlikely their parents will be very happy.