The date as a category or as a topic

We planned to tag the challenges with the date when people are working on it during the OSCEdays. For example challenge XX is tagged June11-06-2015. When I click on the tag I can see all the challenges that are active on the 11th of June.

I think it might be relevant and less messy to put it as a category. Tags will be only used to describe the type of challenges and the task. Eg. Biogas, Software/Coding etc.

What do you think?

Tim and I discussed this offline but just posting here so the discussion is documented for others - making dates categories unfortunately will not work as some challenges may take place over multiple dates, and many events will likely be rescheduled and shifted around.

jeap, and i think, if we have several events later we will end up with a huge pile of date-categories.