Cocktail attire - think along the lines of suit & tie and knee-length / midi-length dress.
We highly recommend taking an Uber / Lyft. While technically you can take public transit to the venue, this location is not the most convenient to transit to as it would likely require at least one transfer to a bus. In terms of driving, see the below note regarding parking to evaluate what mode of transportation you would be most comfortable with.
There is unfortunately very little parking at the venue. There is a limited amount of street parking in the surrounding area, but it's often crowded unless you venture into the nearby residential neighborhoods, which may result in requiring a bit of walking to the venue. We strongly recommend Uber/Lyft/taxi.
No need - the venue is covered. The only thing necessary in the case of rain would be an umbrella or something of that nature to stay dry during transportation.