The closest I've ever come to ballet is the Black Swan and Billy Elliot. Never seen an opera, unless musicals county, in which case I still haven't seen anyone live (that I can remember).
Let me direct you at Gilbert and Sullivan's operettas, if done decently well. There'll almost certainly be some Am-Dram group near you preparing to stage one or other of them. If nothing else, you'll be humming the tunes. (You almost certainly already know the accompaniment to The Major-General's Song (Pirates Of Penzance), so often used for other things.) The words in such a patter-song can be a bit obtuse (late Victorian topicality doesn't travel seemlessly through the years, and then there's social-geography to worry about, but it is particularly traditional for I Have A Little List (Mikado) to be given a contemporary satirical verse or three) but the plots are explained mostly through the intervening spoken lines.
Or look up something from the golden age of Hollywood, like Seven Brides For Seven Brothers. Very accessible, very colourful, some interesting gender politics (enough to argue about) and mass brawling to music!
And if you enjoyed The Producers (the acclaimed 1968 film of a disasterous attempt to stage a disasterous musical), there's The Producer's (the acclaimed 2001 stage musical of the film), also readily available as The Producers (the acclaimed 2005 film musical adaptation of the acclaimed stage musical of the acclaimed film of the disasterous attempt to stage a disasterous musical), which should be an easy watch.