A plus-one is not a plus if the listing is full. Read capacity. If it says four, do not arrive as five. If it says you may apply as a pair, name both people in the first why.
Who to bring
The friend who answers, packs the right shoes, and will not sulk if phones are banned. Not the friend who wanted brunch. Not the friend you are trying to impress with access.
How to write it
“Priya and I both cook at home and want this farm lunch. We can do the 6 a.m. start. Neither of us will film.” Two humans, one intent.
If only one of you gets a yes
Honour it. Do not smuggle the other person. Do not guilt the host. Book a regular table another night if you still want to eat together.
Capacity is on the listing. Treat those numbers as architecture, not a suggestion.