So, I happen to really enjoy the Party Planner mini-game and have spent quite a bit of time trying to find good setups for every possible layout. I might eventually write up a guide at some point, but I haven't gotten that far yet.
In the meantime, since Episode 11 Xmas party planner seems to be the most challenging yet and I've seen quite a few people requesting setups, here's a collection of some that I've found for all the possible random grids in Episode 11. I managed to find at least one 6.5x for every grid, and some grids had options for higher multipliers (up to 7.25x for exactly one grid).
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Hopefully some people find these helpful. If anyone knows of any better layouts, I'd love it if you shared it with me!