at night, go to any community lot,whether scary or not. Wait two hours, and if they don't show up, go to another lot. Beware of becoming friends with one, it could lead to your sim being a vampire.
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you need nightlife. go to downtown and got to a night club or something (you must go at night or there wont be any vampires) then look around until a vampire appears. they are pretty easy to find. they have grey skin, red eyes, fangs, dress differently from others, and will sometimes stalk around covering there mouths. once you find one, if you want to become one, build up a good relationship with them and they will eventually bite you.
NOTE: you cant go to downtown if you Don't have nightlife.
Well 1st you need night life then as soon as you get night line go the first night you get it. Then you go anywhere downtown and find them but just 4 a tip i found like 2 vampires, one at The crypt `o night club and the last one at Cold issue clothing
To meet vampires in The Sims 3, you first need the Late Night expansion pack. Once you have this, vampires will appear in public just like any regular sim. They look slightly different from other sims- they have fangs and red or gold eyes.
To become a vampire yourself, you must befriend a vampire, then ask them to change you.