Why do startup events take place at night?

This may seem like a silly question if you live in Dublin and the event is on in Dublin. But if you want to get people like me from the country with family commitments to do the 2 hr commute to Dublin or the 2 hr commute to Cork then spare a thought for us !

OpenCoffee is great because it takes place during the day which means we can organise students, faculty members from various educational institutions etc. The spirit of San Jose may be to run everything at night and do business during the day but there is some justification to run an event during a working week during office hours,