These are my sentiments too (and I'm a keen camper), as there is very little difference between what I'd take for a night vs a week. Setting it all up isn't worth the hassle for one night (or even 2 really) unless you are a single adult with a very simple and quickly erected small tent. However, given it is a done deal, I wouldn't do any cooking to save bringing the stove and pots & pans etc. Takeaway for dinner, cereal/chocolate brioche and fruit for breakfast, and either sandwiches (ideally made in advance) or eat out for lunch. I would seriously consider leaving our table and chairs set at home and just eat on a picnic blanket, but suspect DH would veto that idea as he now finds getting up and down from the ground more difficult. Definitely don't bother with additional awnings or gazebos. If you are taking DCs, then a ball and their tablets will be sufficient entertainment for the time you have.
FWIW I camped for 2 nights alone last weekend (was there with friends, but they had their own tents), so took a hugely scaled-back set up to our usual family-of-4 trips. I took a very small tent, self-inflating mat, sleeping bag, Trangia stove plus fuel and matches (I ate directly from the pans), one set of cutlery, one water bottle to refill as needed, dehydrated food stuffs plus the odd tin/pouch, clothes and toiletries (inc toilet paper!), a small lantern, a book, a roll of duck tape, a small and basic camping chair, a small low level table and, most importantly, a cool bag full of booze. I used bundled clothes under the sleeping bag as a pillow to save the bulk of bring that. I could have dispensed with the chair easily if needed, plus the food and stove although that would have cost me a fortune and not made a huge difference in space/weight given how small the Trangia is. The mini table is super useful even if just somewhere flat to put your beer.