In this spoiler free chapter of our game guide To The Last of Us 2 you can find a detailed walkthrough of the Old Theatre sequence. Dina and Ellie arrive at the theatre to relax after an incredibly emotional first day in Seattle.
Dina is injured - you have to lift her up. Then, go forward together until you reach the theatre. There will be a long cutscene and a long conversation between the women. For now, leave Dina alone, let her regenerate.
You can explore the hotel. Climb the stairs and you'll find a book on the table - a manual that unlocks the Stealth skill tree for Ellie. From now on you can create silencers and other useful gadgets.
You'll find a radio in one of the rooms. Unfortunately, the device doesn't work - follow the cable and go out the window. Then climb up a ladder to reach the roof. Get to the generator - use the small cable to restore power.
Return to the radio - unfortunately, Ellie won't be able to set it up properly. But you will find a key. Go down and use it to open the big brown door.
You'll get to the main stage. Go behind the curtain to find a guitar. Play another chords on the guitar to end the sequence in the theater. (Dear God, this game is brilliant!) After that a flashback scene will start. You will move back in time by 3 years to learn some interesting facts about the characters and story of TLoU2.