I FINALLY got expert on this level. If you follow everyone's previous advice you can do it. The only way I finally got it was by doin't 3-1 over and then upgrading to 10 more points for dancers on the dance floor. I tried with the other 2 upgrades and couldn't seem to do it. I scored 8060. YOU CAN DO IT!!

Round 1:

Betty
Allison
Empty Seat
Chloe
Betty
Empty Seat

Serve the Betty next to Chloe her food only. Once she hits the dance floor, sit Ernie between Allison and Chloe, Derek on the right of Chloe and another Chloe next to Derek.
Now do everything in combos.

Round 2:

Diane
Chloe
Al
Allison
Empty Seat
Empty Seat

Serve Diane her food only. Once she hits the dance floor, sit another Al next to Chloe, Bob next to Allison, and Ethel next to Bob. Now do everything in combos. You may need to use the champange bottle to cheer up Betty.

Round 3:

Sit Betty anywhere. Just not next to Allison.

I wonder why she's so unpopular in this level?

bump

Thank you Jen for posting that walkthrough. I got expert on EVERY level but that one! So frustrating!! I finally got it with the first try using your walkthrough!