let's be real here though.
if you seriously want to have "mandatory" attendance on a certain timeframe, you're saying you'd accept your members having a lack of foresight and not doing their homework beforehand over them having something to do with their family that may have just popped up as a spur-of-the-moment thing? really?
also the fact that you allow them to just say "i was busy" sorta gives them a free pass to do whatever and then tell you they were busy...
overall not a great system
It shows their dedication. Again, you can miss it 3 times before you are suspended as long as you send an excuse to me.