Some ideas... a lot depends on where you camp and availability to water resources.
1. Usually dig a trench around the perimeter of the large tent to divert rain water.
2. Add some limbs or rocks around the bottom the large tent to add weight in the event of a good storm and tie down to them. Some incredible winds in the mountains snapping BIG trees.
3. We generally have a large common tent for cooking, food, hanging out and gear. Separate sleeping tents away from the cook tent to help avoid Bear issues and keep food smells away from the sleeping tents.
4. Primarily do the of the pre-cooked vacuum packed frozen meals to heat in hot water. Dump on a paper plate . Reduces cooking odors and massive time saver. Sleep is precious.
5. Clothes line and Pins
6. Make a toilet seat on top of four sides easily assembled with screws. Dig a deep hole set heavy contractor bag down in the whole and spread the top out and place the seat on top. Hang Toilet paper/wipes in a zip lock bag. After the hunt disassemble the toilet and haul off the heavy contractor bag.
7. Don't set up around any "widow makers", check for dead trees around your site.
8. Propane Torch is great for starting stoves, fires, & tons of other uses.
9. I generally put a tarp over my sleeping tent if making a base camp. Added protection from the elements and I can divert the rain water the direction I want. "Wet" is not fun.
10. We put a floor in the common tent with either tarps or some roll out roofing fabric we have. Bring a broom and keep it clean.
11. Take two plastic tubs to use for dishes and for sponge baths
12. Take two 5 gallon buckets
with lids to grab creek water to use to boil water for the meals and then to use for washing utensils and bathing with the plastic tubs. It's been boiled.
13. Propane lantern in the common tent for lighting.
14. Our common tent has round metal poles and we have steel wire hangers that hang over the poles with hooks bent up to hang gear on, pots/pans, utensils
15, If you hang your gear /clothes you will minimize mice issues. Keep as much off the floor as possible.
16, Take a grommet kit and good duct tape.
17. Over 10K you can have certainly snow in September. Be prepared for snow.
18. Have plenty of cordage and ropes.
19. Colorado has low humidity and you will be glad to have eye moisturizer drops and chap stick (unscented).
20. Everyone has a designated area for their stuff, helps to minimizes lost items or misplaced items.
21. If rifle hunting no loaded rifles in camp. Open Bolts on all rifles in camp. Can't go off with a open bolt. Always do the "pinky test"
Have fun and enjoy the mountains. Killing an elk is just a bonus!