You can do it with Game Guardian the same way you would modify your attribute EXP, but honestly, just turning on the infinite gems/coins cheat and repeating Butterbeer events in Hogsmeade doesn't take that long. Especially if you have the 3x charisma bonus from logging in every day for a week. If you've already modified your attributes to the max level, you can intentionally pick the wrong answers and you'll still successfully complete each event after one round.