Understand the desire to have a good day but you can have a good day without paying 20k. A lot depends on the numbers you invite. If you have large families then you may feel obliged to invite the whole lot of them. How many were you thinking off.
Good country hotels will do packages €35-€45 per head and usually there is room for negotiation on additional things like a few free bedrooms for a night thrown in.
One option is if you have people who would be giving a present is that rather then giving a toaster or something that will end up in the attic, could they provide a service instease. In my own case, that was how we got the wedding car and the cake, family and friends provided the car and baked the cake instead of another present.
Big thing to ask youself is when you are doing the budget is to ask, is this thing really necessary? Do you, for example, really need 4 or 5 bridesmaids, butterflys or doves flutering around, a chocolate fountain, table gifts for guests etc etc. Answer in our case was no and we still had a great day. People want a good feed in a decent place with a good band, most other things get forgotton about. Bear in mind as well, the more things you have, the more things you will have to stress you out
Good luck but I would really try and cut it back from 20k and be prepared to haggle