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 you can try combining your outward journey with carpooling during your ride home.
Near Antwerp Central Station you can find the Astridplein, where you can easily transfer on various trams and buses. Your combiticket lets you make use of complimentary public transport offered by De Lijn.