I love live theatre....... ballet, opera, music both classical and modern, musicals.... haven't been since before Covid. Last saw Swan Lake at ROH a good few years ago and it was a fairly traditional version, but very enjoyable. While I can agree that knowing the plot line can be helpful, sometimes I think it's good not to know. When I went to the musical Miss Saigon with my favourite sister-in-law and niece, neither knew the story or that it was based on Madam Butterfly. Their shock at the final scene and the tears that flowed were so emotional, and both said they were glad they didn't know it was coming.
crazyH enjoy your outing, take the precautions already advised re sweets and water, but most of all enjoy, and I hope this will be the first of more visits to a wonderful medium.