No way, I've never seen a public viewing, I just like it because it's subversive against a genre I normally dislike. It's a musical that people who hate musicals can enjoy.
And it's catchy as fuck. Everybody knows the Time Warp even if you never did the silly dance.
La La Land is intentionally mirroring traditional musicals with very strong nods to both Hollywood golden age and Demy. Are you sure you don’t actually like musicals?
I tried to watch Tick Tick Boom for example, but it didn't resonate with me.
Additionally to the songs, La La Land has really great cinematography and I also liked that story arc. It's more movie with songs than songs in a movie.
If you are not completely opposed to the idea, you could try Singin’ in the rain or Swing time or even The Umbrellas of Cherbourg. Old musicals have some kind of charm which you don’t really find in modern ones. They are such a huge part of cinema history.
The Blues Brothers is one of the greatest movies of all time but it’s not a musical, it’s a movie about musicians. There are no examples of the characters communicating plot elements via lyrics they sing.
As a person who dislikes musicals, I concur that Grease is an amazing movie. The songs were relatable in an innocent way (i.e. finding summer love). The songs I hear in movies today... they aren't innocent. They talk about things like hating the person you love, and other similarly unhealthy concepts. It is a stark departure from the songs of old.
Grease’s songs are not innocent, only Sandy’s songs are, the men’s songs all about what teenage boys want out of teenage girls. Some of the lyrics are even cringeworthy now.
- Grease (1978) https://m.imdb.com/title/tt0077631/
- Hair (1979) https://m.imdb.com/title/tt0079261/