There are three different ways to have a wedding for two Sims. To get two Sims married, they must first be engaged.
The first way is simple: Have one Sim go up to the other Sim, click on "Purpose," then click "Marriage." They will be married in a matter of seconds.
The second way is to buy a wedding arch under "Misc." in the Buy Mode catalog. Have them stand under it, click "Get Married," and they will promptly change into a wedding dress and tuxedo and get married.
The third way is more difficult, but a lot more fun. When two Sims get married, they have the option of throwing a Wedding Party. Get on the phone, click "Throw Party" and then "Wedding Party." Invite up to four guests to come to your lot for the party. They will come immediately, and you must entertain them for 3 or 4 Sim hours. (Tip: make sure you buy champane, a wedding cake, and also make sure the two engaged Sims get married during the Wedding Party time limit.)
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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.
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