I don't think they'll get it but, I think the best thing I can do is phone round and tell people so that pregnant women stay away, I don't want to cancel. I hope people will still bring their children though. Would you?
TBH I would rather my DCs get it now (especially the girls) and get it over with because the chances are if they don't get it know they will get it at some point and that could be when pregnant.