The Helix is a modern performance venue on the Dublin City University campus, north of the centre. It hosts concerts, theatre, comedy, dance, and family shows, so its usefulness to travellers depends entirely on what is on during your dates.
It is not a sightseeing stop in the way the Abbey or the old city theatres are, but it fills a real gap on Dublin's northside cultural map. Check transport home before booking an evening event, especially if you are staying south of the Liffey.