In the Sims 2, you can have a wedding. The relations must be high and you can marry two Sims of the same sex. Also, the Sims 2 weddings are far more advanced.
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on the game sims 2 castaway
You go into micellanious and then click on the balloons.
Have your Sims get married (must be adult boy+girl, unless you have teenager cheat) and a limo will come to pick them up for their wedding.
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
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!