I haven't been liking the 'click here, here, here, and here'  nature of setting categories on my cards... It feels as if it the most time-consuming part of creating a new card. It drives me crazy.
 
I know as I learn where the occasions, etc I want are hidden in your little trees, the easier it will be.. but then again, as you constantly add more, and rearrange to work better.. there goes the memorization thing.
 
Yesterday I worked at another website that uses about the same means of categorizing, however currently has more categories... and as I cursed trying to find a simple "Earth Day" section, I mused to myself about how the same problem exists here, but in more manegable form thus far, and how it could be improved...
 
As you increase the categories, you are likely to need to subdivide further, making things more and more hidden.. Your site should really consider improving, while it is smaller... and put yourself a step ahead of the other guy.  
 
Anyway, here's what I visualized as a possibility.
 
I'll use Earth Day as an example, but the way it is at the other site (out of my memory)
 
Theirs is basically
 
Holidays & occasions>
 
Holidays - Major (nope not here.. I really think it should be.. it's getting fairly big.)
Holidays - Minor > 4-April > 22- Earth Day
 
It took lots and lots of looking, as I said, to find this... I never remember dates.. and I'm sure I overlooked it repeatedly, since they have so much in the list they use a small font...
 
Would it be possible to add a 'search' feature to this section?
For instance, have categories be clickable in tree form just as they are now....  But also make it so that you can search for a term you KNOW is in the list, like "earth day" and find that result, or any results containing that in the trees...
 
Another example would be "mother's day"
A search for that term would find, assuming these sections exist,
 
mother's day
STEPmother's day
GRANDmother's day
BIRTHmother's day
 
This would make it much easier, and hence quicker and more productive.. to add cards in than the 'climb the tree' method by itself...
 
Thanks for your consideration.

Thanks.
I had indeed not seen the tree..
That should help somewhat.
 
And I hope they find the search idea feasible!
 
Thanks for the reply!