Hate to dissappoint you, but your timing is a bit wrong: the best venue for doing that (the “Bolshoi theater” proper) is closed for renovation. Still, you may visit the “New building” – at least, the dancers will be the same though the aura of the theater is a bit different (if you care for these things).

If not even the Bolshoi, the ballet there has never been known to disappoint, though I do hope you get the chance to accomplish this goal!