There are 2 options for this answer.

1. The event date chosen is further ahead than the next 14 days.

When it is, it will appear in the list.

Note, when refining your search results you cannot choose a date over 14 days in advance. You will be able to see events further ahead on your main listing page in the 'Related events' box.

2. You may not have selected a date when creating the event. Make sure you have and also the day if a frequent event.