I've seen this mentioned before here in the comments, but custom fitted ear protection isn't that expensive if you consider the amount of time you can use them for and especially if you consider the damage to your hearing in terms of monetary elements.
I had to work in very loud and noisy environments and I also cycled to work through rush hour traffic in a busy city. The roughly 150$ for a custom molded in-ear protectors/filters (they lower between 10 and 25 db specifically aimed at limiting big event noises - music/announcers/etc). You can even get models with swappable filters, so you can easily get a few filters for different needs and swap them out.
Check with your local pharmacy or doctor and get them. If you can't afford them as $150 is a lot for many people, I've had a friend use the loop in ear protectors, but at an event where we worked a 16 hour day, he said that they got very uncomfortable, while my custom-fitted ones were still good!