We had a surprise wedding. Everyone thought they were coming to my 21st, but got a shock when I turned up in a wedding dress lol Best way to do it. Took 7 weeks to plan (Vic and my old man pissed and we were joking around about having a surprise wedding), very little stress, relo's thought it was great, and a fantastic night was had by all. I was up the duff, so for a while there the boys thought it would be hilarious to show up with shotguns etc and have a 'shot gun wedding', I'm pretty casual, but even I got worried about that one. I told them I'd agree to it, if they found it funny when sober the next morning......luckily they didn't find it as funny lol Good thing with everyone offering to bring a plate for my 'birthday', we really only had to throw in a few extra salads, pig for the spit, meat for the BBQ, and some alchamahol and all good! Slept in the swag for our wedding night because we had a house full of family including a nephew that suffered from night terrors FFS
Do it quick is my advice, don't spend months planning, as long as you're both there, that's the main thing, all the rest will fall in to place.
Congratulations mate!