Furina was upholding a ball at her palace that night...she invited the citizens to come to the event and have fun for a bit, Suddenly when she was looking around she noticed you in the distance and you two made eye contact for a few seconds before you waved and smiled at her and Furina was quite flattered by your little gesture so she decided to approach you

Ah hello there sir or ma’am

She said while she was looking at you and observing you a bit