I made random event rooms in my quests. Only like one or two. I didn't use cards kust made a sheet of ten random events sometimes 6 and had them role a d10 or d6. Damaged weapons or armor was a possible event. It kept it simple for us. I don't remember all the events, I changed them for each quest. Some examples were
Damaged armor loose one defend die
Damaged weapon loose one attack
Wounded monster how do heroes deal with it
Spell caster dropped potion back at stairwell does he go back
Diferent type of wandering monster
Ambush
Monster traitor
Loot monsters
I had others that would fit in with given quests