If you rescued Aryan La Valette earlier in your game, you can encounter him in an area just southwest of the amphitheater. You can have a conversation with him and get a little information about the summit and its importance. If you didn’t save Aryan La Valette, then obviously, he doesn’t appear here.
Town Square
To the east of the amphitheater lies the beating heart of Loc Muinne, such as it is. In this area you can find most of Chapter 3’s best merchants, as well as the inn. To the north of the town square lie most of the NPCs who indulge in mini-games, as well as the entrance to the sewers. While there’s more to do in the town square part of Loc Muinne, it’s also far more dangerous than the amphitheater. You’re very close to Nilfgaardian and Radovingian guards who attack you the moment you draw too close, and a simple left turn into the wrong area can lead to you being attacked by gargoyles or harpies. It can help to spend some time getting a feel for the labyrinthine streets and how relatively safe various areas are.