What word is described by the following limerick?
A place where the lions may roar?
A place you attend after four?
The usual sense
Will shortly commence
Exploding with colors galore!
I will accept the first answer that explains all the clues, including the one in the title.
Hint/clarification:
For lines 4-5, you may wish to note when this riddle was posted and what my location is.
Further clarification:
"When" and "where" in the above hint are meant in a very general sense: think "what time of year" and "what continent."