The Wedding Invasion was not the grand revelation of changelings to the world. True, only a few ponies knew of their existence before the incident, but changelings have been living in Equestria for years, and many ponies see them as a common part of their lives.
Sawtooth is a prime example of this: a musician who has lived peacefully in Manehatten for years, and is well-known in the music community as a fill-in for musicians who are... otherwise occupied.
Neon Lights gets predictably wasted, and Sawtooth fills in for him.
This story is about 87% dialogue. Be warned.
A very interesting concept you've got here! I like it a lot.
I assume the wedding in question is the royal wedding of Cadence and Shining Armor? Probably a good thing he sat that one out, considering how events turned out. I can't imagine it made his life very easy afterwards, either. I kinda have to feel bad for him knowing what's likely in his future.
This was beautiful and I crave a sequel :V