You can use No Expert Maps to highlight where special events are taking place. This is most effective when events are spread over multiple locations.
Here are examples of Special Event Maps.
The first two examples show a single event that forms a trail :-
Lines can be added to show the route associated the trails :-
The next example shows the locations and dates for multiple events taking place over a set time period like a bank holiday weekend or the Christmas season :-
Maps like these can be embedded on Websites/Blogs before the Events and removed after the Events have taken place.