Помогите пожалуйста! англиский Complete the text with the correct forms,past continuous or past simple,of these verbs.

When I was walking through the park at 6 o`clock yesterday evening,I saw posters for an open-air rock concert. A man was selling tickets, so I stopped and bought one. Later at the concert,I was looking for a place to sit when I saw two of my friends.They were standing at the front,so but we were still waiting for the band at 9 o`clock! When they finally started at 9.30 it was raining. Everyone was wet and miserable.Then,when the band was singing their first song, a fan jumped onto the stage. The concert stopped for a few minutes,then the band started playing again. They were playing their second song when the lights went out.There was a problem with the electrics because of the rain! In the end they canceled the concert.What a disaster!