During the second week of February the Palau de Musica in Barcelona, worth a visit even when there isn't a concert happening, is doing all of Beethoven's symphonies over the course of five nights:
https://www.palaumusica.cat/en/complete-beethoven-symphonies_695071?
The size of the hall, mid-size by modern standards, is great for appreciating the development of Beethoven from 'classical' to 'romantic' over the course of these compositions.