Event Matches for 8bDM? Sure, why not. Still, does it have to be on vanilla maps only? Anyway:
Name: Silver Setting Sun
Stage mission takes place in: MM6TOM
Description: Tomahawk Man has challenged you to battle! You have vowed to beat him before the sun sets completely...
Game Mode: Duel (10 Frags, 3 Minutes)
Other notes: Only Silver Tomahawk frags count. Lowering the enemy's health with other weapons and finishing them off with Silver Tomahawk is alright. If the timer reaches 0, you lose even if you had the score advantage.
Name: "Poor, Poor Toad Man" or "Everybody hates Toad Man"
Battlefield: Toad Man's Stage, perhaps?
Mode: TLMS
Description: You have to protect a Toad Man bot from three Mega Man bots. Simple as tha'. Toad Man has Rain Flush, Mega Men have Drill Bombs.
Would be funnier (and challenging) if it was Drill Man's stage and the bots were Drill Man. In Toad Man's stage, there's plenty of room to hide and the bots get stuck almost always. Just saying.