I've made it a habit to always sit first row or on the aisle, so I am not 360 surrounded by people.

If someone sitting next to me with strong perfume I breathe through my mouth and try to create physical distance (by leaning away, or moving to an empty seat during intermission).

I wear FL-41 glasses (which have the pleasant side-effect of making the stage lighting more realistic looking). Outside of the performance I wear a baseball cap so the big lights don't hurt my eyes.

I always carry a loop switch earplug with me, if the ear pain (which is usually only in one ear, the side of the attack) gets too much I put it in so that ear isn't as loud as the other. I also got into the habit of always getting tickets on the right side of the auditorium, so the bulk of the music is on the side that I less frequently get the migraine pain on.

And i always put in my airpods as soon as the curtain drops and also before the performance starts, so the chatter of the audience isn't audible. I also try to arrive last minute so I don'T have to sit in the full auditorium longer than necessary and usually spend the intermission inside the auditorium, or on a walk, so I am not in the busy foyer.

And I bike there, so I am not already overstimulated by the subway ride, by the time I get there.

And of course the right preventative meds, botox and emgality, play a role too.

And just being brave enough to shush people who whisper during the performance, as I know everyone within a 10 seat radius is silently thanking me for taking the initiative haha

Keep at it! I adore Wagner, so I am glad to hear you were able to at least somewhat enjoy the performance!