Final answer:
Winston receives a note from the dark-haired girl confessing her love, sparking secret interactions and leading to them arranging a clandestine meeting.
Step-by-step explanation:
Winston arranges to meet the dark-haired girl by receiving a note from her that says "I love you." After a series of careful interactions to ensure they are not watched, they agree on a place and time to meet in secret, away from the prying eyes of the Party. Their initial conversation is cautious and brief, but it sets into motion their secretive relationship amid the oppressive surveillance of their dystopian world.