Why does Susanna arrange a meeting with Count Almaviva in the garden?

Susanna arranges the meeting with Count Almaviva in the garden as part of a plan orchestrated with the Countess to expose the Count's infidelity and teach him a lesson.12

The Countess, saddened by the loss of her husband's affection, encourages a reluctant Susanna to agree to the Count's advances. By pretending to accept his invitation for a tryst, Susanna creates an opportunity for the Countess to impersonate her, wearing her cloak and disguise. This deception is intended to catch the Count in his dishonorable behavior, ultimately leading to his public embarrassment and his eventual request for the Countess's pardon.21