Your first duty in assisting the town guard is to join Jaroslav the watchman, also known as Nightingale, on patrol between 11:00 and 19:00. Once you have picked up the armour from the lower room of the armoury, you can find Nightingale in the grounds of the church.
When you speak to Nightingale he will ask you to follow him on patrol, during which he will provide you with a brief tour of Rattay. Along the way you will encounter a dispute between the Rattay weaponsmith and a beggar from Skalitz called Jane. Your first task is to resolve the dispute in a way which keeps both people relatively satisfied, however this will depend on your own role play sensibilities.
After some time you will find yourself at the tavern. Nightingale will ask if you want to have a game of Farkle, the rules for which are contained within the mini game. If you would rather not play, you can decline and wait for night to fall.
As night falls you will be asked to ring the bell at the Rathaus to signify the ending of the day and the closing of shops. Be sure to hold your torch as you walk through Rattay to avoid a scolding from fellow guards.
The last duty of the day is to ensure the closing of the Trader's Tavern by the market square, a place where some customers are reluctant to leave. This time it is a special customer; Sir Hans Capon.