It might be possible to do but they'd have to be very careful with what they choose for the wedding and would miss out on a lot of 'traditional' things to do so. If they've got a lot of useful friends who are happy to pitch in with the catering/band/venue etc then it becomes a slightly more realistic proposition.
My sister in laws was only a couple of grand because family was able to help lots.
They had a registry office wedding (not a bad place actually), uncle runs cricket club so post wedding vows and evening venue sorted for free, brother is a dj so entertainment sorted, she has friends with smart cars (nice 7 series and some other nice looking barge).
Their parents paid for honey moon.
All in all they didn't spend much but had a great time
