Consider yourself whooshed! 
Inside the house is where they stable the horses.
Oh wait, maybe it was just I who was whooshed! :smack:
On second thought, let’s not go to the wedding. It is a silly place.
This is what most people do. There normally isn’t room inside an ordinary house so the usual thing to do is hire a large room in a hotel or pub, the local church / village hall or a social club . The caterers and band/disco are hired and there you have the wedding reception. The small size of the average back garden ( yard ) would also rule out many people using a marquee at their own house. It just seems that marquees are used by those sort of people who want to be noticed.
Marquees have full flooring, assembled in sections.
Actually, I phrased that rather badly. The marriage ceremony is performed elsewhere, while all the festivities afterwards are held in the tent. As Quartz has pointed out, the reason you don’t it have inside the house is because the people who live in the houses that hold these sort of events probably don’t want stuff which has been in their family since the Crusades getting ruined by the drunken uncles/crying girls.
The last wedding reception I attended I was banned from my normal role of “drunken uncle pestering all female guests” This was because I had to play the role of “father of the bride giving a speech disparaging my new son-in-law and his family” I enjoyed this much more than the "uncle"role, and I’m sure that my subtle insults were much appreciated by those present (not in a big tent unfortunately- I know my place in society)
Waking up in hospital the next morning was a bit of a downer but I heard that the in-laws were very sympathetic about my broken arm and nose.
I just wanted to add though that working class folk like myself do have the opportunity to use a marquee, and my chance arose when having to attend a party during the last World Cup final the host realising that there might be a conflict of interest installed a huge TV screen showing the match. Instead of vol-au- vents we had chicken curry - a much better idea. Beer and curry are naturally meant to be taken together, it’s a tradition.
Kidding aside, I learned something here. I’m an American. I call that thing over the entrance to a theater a ‘marquee,’ and I call that thing in which outdoor, summertime charity auctions and alumni dinners are held a ‘tent.’
For those of you who are British speakers of English, what do you call the structure with the large letters on it in this photograph? It is a picture of the front of The Palace Theater in London.
An awning.
Or a canopy ( as opposed to a canapé which is eaten at British weddings )
Hmmm…I’d probably think of a canopy as something free-standing, rather than attached to a building. Different strokes…
Are you trying to spoil ( my rather weak ) joke ? 
I’d simply call it a sign.
That’s why we Americans think you Brits are so fetch!
“So fetch”??
I don’t get it (meaning in context). Care to explain?
I’m not British.
And, like confessorknight, I don’t know what *fetch * means either.
American awnings: Awning. Awning. We usually use awning to describe a fabric covering on a frame of some kind that extends from building to provide shade (like the first two above), or a small metal shade that covers individual windows, like this.
Maybe it’s not clear from CBCD’s picture, but that’s pretty much what’s outside the Palace Theatre - albeit on a more substantial basis!
No, the Birdie Song is about 20 years older than the Ketchup Song (official name of the Chicken Dance).