She lists all the outbreaks that have affected significant days. If you get an outbreak in December it might affect Christmas. If one falls in January Australia Day could be affected. One in February could affect Valentine's Day. A March outbreak might affect Easter when that falls early. If one occurs in April ANZAC Day could be under threat. Mother's Day isn't safe if there's a May outbreak, and don't be surprised if the Queen's Birthday long weekend is affected in the event of an outbreak in June. Put simply, if you have a lot of outbreaks and a lot of days that are commemorated in one way or another, the outbreaks might affect the days of commemoration.
