The disciplines of Lent can be many, but it is obligatory for all Catholics to abstain from meat on Fridays during Lent.
Should you forget on a particular Friday try to transfer the obligation to Saturday to make up for it. Don't obsess about it, just transfer the obligation to another day or something else.
Bishop Dolan has given a dispensation for St. Patrick's Day. So eat all the Corned Beef you want on that day!