As mentioned above, marquees can be flippin’ expensive. My father in law is a farmer so we could have a field for free, and it still worked out cheaper hiring the village hall than hiring a marquee & loos. Appreciate that the ambiance is different, and if a marquee fits your plans it’d be worth telling them you’re hiring it for a re-union, or a retirement party or anything – there’s often a significant surcharge just cos it’s a wedding (thieving sods)!
As for the booze side of it, we got a load of 20L boxes of Weston’s Cider and Perry (my local brew), and a few firkins of Skinners Ale (my OH’s local) – both direct from the makers. I expect most cider makers would be happy to deliver a couple of barrels if you’re buying in that kind of quantity…
Enjoy the day, sounds like a lot of fun!
ETA Village Hall with a skittle alley = good for giggles when the cider’s been flowing