Yes, however they do also offer corporate type parties so I've had luck at "non-business" hours as well. I imagine if they are open but you didn't get through, they may be at break or proctoring a room.
Yes! Never had a problem reaching them during their listed hours.
This is the sort of place where you want to make a reservation, and not just "stop in". Just call them, they are great people to work with.
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