I'm getting married next summer so I'm not 100% sure yet...
But so far:
MIL is making mine and my one bridesmaids dress
And making my fiances suit (or buying him one if she doesn't make it)
My Mum is doing all the flowers, her brother is a wedding photographer so he is doing photography and any costs incurred are being paid by my mum.
My Dad is paying for the venue hire for the reception, £600, though we may be extending it so he will pay more for that.
So we have food, rings, the church and extra decorations. The church is £600, then the rest is basically how much we decide to spend. We are thinking that we will invest in nicer rings after the wedding, the church is £600, extra decs could be zero expense or huge depending on what we want to spend, and food again could be very little or a lot. The focus will be on lots of food and drink though. We are young and poor, so probably £1-2000 put in from us.
I'm not sure what we are doing about a honeymoon, probably won't have one, or do it for our first anniversary or something...