As a suggestion for a small improvement to the K2 extra field, would it be possible to add data verification to the date fields.
I have just had to work out a problem where a user put 'tba' in the date field as they didn't know the date of an event, the system excepted this entry but caused an error when trying to view the link to the category.
Thanks to the developers for the K2 component, well worth the small learning curve to gain a lot of flexibility and features, brilliant.