We have during the last week recognized several issues with the event/calendar-function. Events have been moved around unexpectedly and the set date for an event is not necessarily what is being shown in the calendar monthly view. For example: If I create an event on Saturday 2016-11-05, the calendar monthly view will show it on Monday 2016-11-07. If a visitor opens the event however, they will see the correct date in the detail section on the left.
Therefore, make sure that you click on the event you are interested in and confirm the actual date! The correct date can always be found in the detail section on the left on every individual event.
Unfortunately we do not know how long it will take to resolve the issue but we are working together with our supplier to have it solved as quickly as possible!