I think there's some confusion...
Le Cellier will create an inventory for any given day based on their staffing, turn-over, etc. Since it's 180 days out, it's not exact and if it was a smaller restaurant, they'd end up staffing CM's based on what was left unbooked prior.
This is kinda of what it looks like, (number of people at table)xtables ...
Seats: (1-2) / (3-4) / (4-6)
Time...
11:00 0 / 2 / 3
11:15 2 / 1 / 2
11:30 4 / 0 / 1
11:45 2 / 0 / 0
12:00 0 / 2 / 3
This would be based on a 1hr turnover, and thus repeat the pattern every hour. It's not exact, and it's tweaked, but it helps explains the rest.
There are rules!
First, there's not every table at every time. If you call as a party of 2 and want 11 or 12 on the hour, you'd never get it because it never existed. Restaurants vary, and table sizes often overlap, but at places like Le Cellier, they firmly reserve 4tops for for parties of 3-4 only. The general rule is that leaving more than 1 seat open at a table is a no-no. You can see with 4 though, the options are at the 6t or the 4t.
So, you can see how with people calling in and getting ressies, certain party sizes will be locked out until XX date. That happens frequently, but also it can be all tables are gone for everyone. That happens a lot too.
Now, Candlelight Processional...
They'll have the regular inventory like above, but it will have fewer than normal number of tables. They know CP is coming. Then there will be a seperate CP inventory. Three actually. Each special inventory will relate to which showing of the CP you're going to see. The 5pm show will eat afterward and the 8pm will eat before.
Secrect: Some restaurants don't offer some showtimes. Always be flexible in your showtime if you want to do CP.
So, why CP is so hard is that you're fighting to get a subgroup of the inventory that even smaller. Yes, they do still make restaurant ressies without CP during the CP, it seems absurd but not everyone wants to see it and capacity prevents it too.
Also, the capacity of the theatre is 900something, split amoung all of the participating restaurants. Le Cellier's share goes quickly, and well.. how do you suppose they fill up Marrakesh around the Holidays? It's not the festive food offerings...
So, booking a table prior to candelight starting booking will do you no good. It wont hold a table. The table booked has to come out of the CP's own inventory.
One last thing: Day Of.
The Day Of a CP, there will be extra seats in the theatre still available (sometimes, not always). These seats are unclaimed tables scattered throughout the inventories of the restaurants, or a mass of single-seats left open at table (lots of parties of 3 booked tables for 4). When CP books, the theater itself is a "mass" inventory that just ticks-down person by person unlike tables that go away in chunks.
If the theatre has 4 people open in it's own inventory for a showtime, the regular inventory at restaurants will be allowed to use it. This only works Day Of a show. So, if Le Cellier has a table for 4 within a time period that could eat and see a show reasonably (i beleive the rule is 2 hours before or after showtime) then it can be booked as the CP package.
Hope this helps, and good luck.