Here's a Walk-thru for Disco Level 3. Please give it a try and see if it works, DB. I tried doing it with, at the most, four tables each round and it gives an Expert score.

5 - Bookworms
4 - Tourists
2 - Celebrities
2 - Lovebirds
=========
6 - Seniors (Yellow -- arrive last; seated last)
4 - Businesswomen
4 - Businesswomen
1 - Celebrity
==========
6 - Hungry Men
4 - Hungy Men
2 - Yappers
-- Seat all at once, yappers first (they'll be impatient)
take all orders; serve; cash out yappers only; serve HM second time)
===========
6 - Seniors (lower left)
6 - Celebrities (arrive last, seat last)
4 - Seniors
4 - Bookworms
============
6 - Businesswomen
6 - Businesswomen
4 - Businesswomen
4 - Bookworms
=============
6 - Teengirls
4 - Teenboys (middle, lower table)
6 - Teengirls
4 - Yappers
=============
6 - Bookworms
6 - Bookworms
4 - Joggers
=============
6 - Bookworms
4 - Bookworms
====================

Hope this helps!

CORRECTION:

In the second to the last round, which reads above:
6 - Bookworms
6 - Bookworms
4 - Joggers
=============
.... It should really read
6 - Bookworms
5 - Bookworms (yellow)
4 - Joggers

Sorry about that!

Cruzer,
Thank you so much I will let you know win I bet that sucker.I really appreciate all the tips and tricks that people like u and others that have heped me . I had never even posted anything anywhere until I bought this game . I realised I had been missing out on a lot of fun. Thank you Everybody!!!
DB

Thanks so much for the help! I didn't follow it exactly at the end... even so I scored 33, 810... and that was with a table lost... woohoo!

Where in the heck is the Disco Diner,lol???? I'd like to see it eventually. ;-)

Thanks.