Final answer:
Marji's dad brings light to the darkness at the party by playing banned music and challenging cultural norms in 'Persepolis.'
Step-by-step explanation:
Marji's dad brought light to the darkness at the party in Marjane Satrapi's graphic novel 'Persepolis.' One example of this is when Marji's dad brings a cassette tape to the party and plays music that is banned in Iran. This brings joy and light to the atmosphere, as everyone begins dancing and enjoying themselves.
Another example is when Marji's dad openly criticizes the oppressive government and challenges the strict cultural norms by encouraging Marji to dance with the boys at the party.