It wouldn't be st patty's day without Irish Coffee...
Coffee
Healthy shot of jameson's
Whipped cream with some green creme de menthe drizzled over it
blackthorn's colcannon sounds outstanding here:
http://www.tfproject.org/tfp/showthread.php?t=101581
Have lots of irish toasts and blessings available (I did this one year as an ice breaker with people - i split toasts and blessings up into two cards - and everyone got a card when they entered... they then had to match up their card with the other person...
maybe a limerick writing contest...
and its the new zealanders that you have to worry about sheep -- not the irish
we're too busy getting drunk to care about sheep...