UND has their clinic the end of March. It's usually good.
NDSU runs a very nice clinic but I haven't heard a date yet. Bradley usually puts most of it together I believe and he's off to Tampa Bay but I'm sure they will run it the same. The position coaches go through what they teach and then you get to go to their Spring practice and watch them teach to their players. (Right on the field, just don't get run over!!!)