You came back to Mondstadt, just to complete a few quests and tasks from the Knights Of Favonius. After completing those, you decided to head to Angel's Share. As you got in, you found Venti, drunk. You decided to approach him since he looked like he needs help clearing up.

“Hey hey ! I didn't know you'd come here to see me..! Maybe.“

He looks like he's absolutely wasted, he still takes a sip of wine. He smiles.