How can I train for an Irish Dance Feis?

As great as conditioning is it doesn't actually help all that much in Irish dancing. When I have a competition coming up I drill little pieces of my steps over and over and over. Think about your feet placement (cross over, turnout, on your toes, etc). If you can get a mirror so you can watch your feet it is extremely helpful. A small plywood board is also a great investment because hen you can practice hardshoe at home even if you don't have much space. Make sure all of your rhythms are sharp and clear and that you kick your butt every time.