Congratulations on your impending nuptials and enjoy YOUR day.
It is your day, have it how you want.
How much of the planning is down to you and how much is down to your dh-to-be.
What is important to you? I wanted a nice dress (I got one half price in a wedding shop that was closing down, my sister got hers from a shop just selling evening cocktail dresses etc, because when you put the word 'wedding' in front of anything it goes skyrocket it price!)
I never knew I needed special shoes until I saw them, or a tiara!
If your MIL wants to invite people, is she contributing? My parents and in laws basically paid for our wedding. But then it was quite traditional, which is what we wanted.
Please just focus on you and your dh-to-be and what you want.
The only thing we spent ages on that really was a bit of a waste was a photographer who produced a lovely album we rarely look at. The wedding video we did with the help of friends means more to me!
If you have £1,000 to spend to put behind the bar for people to drink, is that what you both want to do?
I really am not that much into drinking but I love my food so I'd rather provide food, like buffet, not expensive but nice, and cake!
Maybe like a private room at a pub and have it how I wanted and provide some drinks but basically the evening would be a paid for bar.
But that is not what you want so you choose your day. You want to be able to look back and say "I did it my way" or rather "We did it our way!"