That's why I have these on my Amazon Subscribe & Save.

I live with earplugs in my ears almost all the time.

I buy these cheap disposable ones off amazon, and keep them in my car and in a little keychain holder at all times so that I always have them if I unexpectedly run into loud environments. Sometimes I bite them in half to make them flush with my ear canal, and most people mention to me that they had no idea I had them in until I told them. I suppose they only would be non-noticeable if you have fair skin though.

As for protection, I wouldn't recommend them for super loud environments - but they do the job for most bars, mowing the lawn, and some concerts.

Earplugs. Something like these. Trust me. I tried to just muscle through and hope the noise is just a one-time thing, but I caved one night, ordered some on the spot, and do not regret it in the least. They won't help now but you'll feel better knowing you'll have restful nights on the way.