Keep in mind that returning home by train after an evening event is often not possible anymore. So please check in advance if a smooth travel homewards will be possible. Or try combining your outward journey with carpooling for your ride home.
The closest train station to Capitole Gent is Gent-Dampoort, which is a short walk away (15 minutes) from the venue. The bus lines 70, 71, 72, 73, 74, 76 and 78 departing at Gent-Dampoort have a stop in front of Capitole Gent.
The main station of Ghent, Gent-Sint-Pieters, is located at a 30 minutes walking distance from the venue. A variety of bus lines passing the Capitole is available here as well: lines 70, 71, 72, 73, 74, 76 and 78. A bus ride from Gent-Sint-Pieters to Capitole Gent will only take around 12 minutes.