This is more of a game than a lesson plan, but I've found it extremely effective for teaching treble and bass clef note names. On a large piece of cardboard draw a treble clef on one side and bass clef on the other. Split class into 2 groups and have each line up in front of the staff.
Game continues until all have had a turn.
My students love this game and beg to play it. Have a tournament. Challenge the winner yourself and offer a prize if the student beats you. Use the game as an incentive for completed work throughout the year.