Ask HN: Why are startup events/conferences in Bay Area held on weekdays?

I recently moved to the Bay area to work for a startup. I subscribed to startupdigest in hopes of attending startup & networking events in the bay area. However, I find that many of these events are held on weekdays which makes it very difficult to attend. Attending these events means taking a day off or leaving really early from work.

I'm not saying that there aren't events over the weekend, but more often i find them scheduled during a weekday.

Does anyone else feel the same way ? Or is it just me ?

edit: changed title per suggestion below