CLASSICAL CONCERT | Kronos Quartet at the Ruins of Carmo Convent | Baixa | 35-70€

Admittedly, this one is a little pricey, but the Carno Convent is beautiful, over 600 years old, and has no roof!
Also, we keep hearing the Kronos Quartet is really good. So, if it won’t leave you in ruins, come hear them raise the roof under the night sky (…oh, wait).
More here.
And here’s a soothing glimpse.