Celebrating Christmas in July is great, but the thought of dressing in a fur-trimed Santa Claus suit when it's 90 degrees in the shade doesn't sound too appealing. Going to your favorite pub on St. Patrick's Day dressed as a leprechaun would be a fun adventure, but sounds like a lot more work than just wearing jeans and a shirt. When 4/20 rolls around, you'd like to partake in that holiday but since it isn't legal in your state you can't. Such problems!
Obviously an easier way to party is to wear a festive, seasonal shirt. We have a Santa Claus shirt that looks just like his famous suit. There are St. Patrick's Day tees that look just like green tuxedos so you can still work with your leprechaun idea. And our 4/20 shirts are so great, looking at them might give you the munchies. Bottom line: whatever the occaison, it can be easily and comfortably celebrated with a great shirt.