I've only heard some Raff's chamber works at a concert. I listened to the recordings of his symphonies two or three times though.
I live in Moscow and they play late Schumann here regularly at the recitals in the Conservatory. Variations on an Original Theme and Gesange der Frūhe in particular. Mid-period Schumann too, like Album fūr die Jugend. It's not rare to hear a young pianist with them in their repertoire. I would've never actually checked the recordings of those pieces if I haven't heard hem in concert. The idea of doing it simply wouldn't have crossed my mind. But I guess the professors of the Conservatory generally encourage the students and postgraduates to perform less-known works by famous composers. You probably would not believe me when I say I once attended a concert the entire programme of which consisted only of Debussy pieces for piano four hands but that happened.
In general you can become familiar with lots of obscure music by going to the Conservatory concerts. I once attended a performance of Eduard Tubin's Double Bass Concerto that was followed after the intermission by the performances of solo and chamber double bass pieces by Hindemith, Ustvolskaya, Lutoslawski and a Baroque-era composer I can't remember a name of. Chances I'll hear this music ever performed in a non-musical academy setting are close to zero (apart from Ustvolskaya maybe).
Strangely I've yet to hear any symphonic Schumann in concert.