How might a Discordian celebrate holidays?

I am wondering, at this moment, if I have a constitutionally protected right to dress like a pirate at work every September 29th? After all, it's part of my religion, and freedom of religious expression is a constitutionally protected right. Therefore, given that it is part of my religion to talk, and dress, like a pirate on International Talk Like a Pirate Day, should I not be allowed to dress and talk like a pirate at work?