Mid-day I've found that BBB is usually backed up a bit -- and depend if you're going for the full package or not, I wouldn't make a dining reservation for any earlier than 5:00-5:15.
5:30 at CRT. 5:50 would be pushing it for 1900. I'm thinking you won't be done at BBB until about 5 or even later if they are really busy. I would make 1900 for 6-630. Give yourself breathing room.
It'll be tight for 5:50 but doable if the wait at BBB isn't backed up. But consider if it is, you need to walk toi entrance, wait for monorail, pretty much go around the entire monorail loop (Contemporary, Poly, TTC, GF) and go up the elevator. When the girls are all dolled up from BBB you want a slower casual walk more than a sprint to let her enjoy the BBB experience.
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