I don't think there is a "rule" but I would dress nicely because you never know who you could meet. First impressions and all that. Slacks and a dress shirt would be fine I would think.
"All our dreams can come true -- if we have the courage to pursue them." -- Walt Disney
We must have different Gods. My God said "do to others what you would have them do to you". Your God seems to have said "My Way or the Highway".