I usually don't bring a desktop organizer when I got to retreats... I just keep all my tools in my rolling tote that sits right next to me in their appropriate pockets so i can find them easily. However, I do find myself digging out the essentials: adhesive (tape runner and glue dots), scissors, paper trimmer/s and just leaving them in a corner on my table while i work.
Mind you, I bring one rolling tote JUST for tools... the other rolling tote is JUST paper... everything else (embellies, chipboard, pictures, etc) are all packed into a Rubbermaid type tote and I just carry that in and find a corner and open up shop! When I go to a retreat, I bring just about everything. I am HORRIBLE at planning pages... I've tried and I just can not do it. I always find myself saying "this page would REALLY be great had I just brought that pack of stickers" or "I can't just NOT put that flower that I have at home on this page!!!"
I'm not an "expert" retreat-goer - I've been to 3 and we are going to go to our 4th in about a week and a half - but I've got it pretty well mastered on how I can pack (and function) now. The BIG thing that will be different for me this time around is that I organized my stickers and my scrap-paper.... I won't be bringing along my baby or my wedding stickers (for example) when I'm working on my nephew's ABC album so about 1/2 of my entire stash will be left at home. I'm also kind of in the process of going thru some of my patterned paper and getting rid of (donating) a bunch of it that I will probably never ever use. They are paper packs/slabs that I was really only looking for a few pages out of... got those out and used and the rest just sits there. All of that unwanted paper won't be coming along either.
Check ahead with your retreat to see if they have a Cricut, sewing machine, ink pads, Cuttlebug, etc for you to use. No sense in bringing your Cricut and all of your cartridges when they are already there and provided for you! Most places will now provide a Cricut but they want you to bring your own mat. Make sure to double check what cartridges they have so you aren't doubled up there. If you do bring some cartridges, take them out of the box and put the cartridge, overlay and book (if needed) into baggies so they take up less space.
Go thru some of your old scrapbooking magazines or books and either bring along just a few or tear out a few articles, pictures, sketches, etc that will help to keep you inspired. I find SU! and CTMH catty's are GREAT inspiration starters and will get me back on track if I've lost my mojo.
And last, but not least, don't forget the snacks and tunes!!!
I know this is a lot more than what you asked for.... sorry!!! But I hope it helped a little bit! But, back to your original question... since I don't have one I can't say first hand but if I did, I would probaly get something like
this