Technically you can't, but right when the first person arrives you can "Ask Everyone to Leave" and they'll all go home without anyone getting married yet. Your sim will eventually get an unhappy moodlet that they missed the wedding party :/
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No, not so far in the sims 3 you can't. You can have a wedding party at any community location though, and get married anywhere in your sims 3 town!
On Sims 2 you can buy wedding arches in the 'buy catalogue' under party i think. On My Sims you cannot get married, i don't think. On Sims 3 you have to go to a church. Hope i helped
Do you mean cancel the wedding before or at the wedding ceremony? If before simply click on the Sim you were going to get married to, then, click MEAN, after that click break up or whatever it says. Do the same at the wedding ceremony, maybe start a fight or something like that to make even more amusing. If you invited guests they will all eventually leave the ceremony LOL!
Sadly, you can't go to a party in the Sims 3. You can only host them. :(
You need to wait until the party starts, and once the guests have arrived at your party, click on one of them and go down and you see where it says 'Ask everyone to leave'.. Click on it, and the party will be over. Hope I helped.