Answer: GET A BABYSITTER...
As a member of a former restaurant owning family, I'd hate to think of the $$ my family would have lost had we not allowed families into our establishment.
Get a babysitter? Easy for you to say when you aren't paying the lease.
Baby sitters are for wimps.
A few months after our twin girls were born (in Belgium) we were invited out by another couple to one of the best seafood restaurants in Brussels, so we hired one of the teachers at our five year old son's primary school to baby sit him and the girls (the school promoted this as a way for some of the younger teachers to supplement their income).
We'd just finished the main course when a waiter came up and told me we had a call. When I got to the phone it was the baby sitter and all she said was a tremulous "I'm ready to be relieved now". We got back to our apartment and within ten seconds of paying her the babysitter was out the door.
We found our phone book on the dining room table opened to the restaurant section with several pages torn as she had obviously looked for the number in a combination fit of anger and desperation. The woman was trained to deal with small children and our girls sent her into a near nervous breakdown in just a couple hours! Ahhh, such good times.