I am very fond of my ear plugs. I greatly recommend the foam ones that Mark mentions -- they also come in a beige color. Having used them in a prior profession, I was very familiar with their proper use. You need to practice getting them in properly. It will probably take a few tries

As for mass, I have successfully implemented the following strategies: keep your eyes fixed on a stationary object, sit in the back, stand/kneel first (so you don't have to watch others motion). The biggest hurdle for me was all the movement. I would definitely avoid a candlelight mass.

Enjoy the holidays.