The Ancienne Belgique is only a 10 minute walk from Bruxelles-Central station. Most concerts stop at 10:30 pm so that you can still get home with the last SNCB trains!
With the SNCB code on your concert ticket you can buy a nominative e-train ticket Ancienne Belgique at a very budget friendly fare.
These E-train tickets are available exclusively on https://www.belgiantrain.be.
The E-train ticket Ancienne Belgique is valid for a return journey by train in 2nd class from the Belgian station chosen by you to the station of BRUXELLES-CENTRAL.
Your concert ticket is not valid as a train ticket.
If you're departing from Brussels Airport - Zaventem station, the Diabolo fee for the outward and the homeward journey will automatically be added.
The concert fans from abroad can combine their E-train ticket Ancienne Belgique with a transport ticket (outward and homeward journey) which is valid on the foreign railway network until the Belgian frontier. As from there, the E-train ticket is valid to Bruxelles-Central station.
All info, price and purchase of the E-train ticket: https://www.belgiantrain.be.