Go into Club Coco (I bribe the bouncer to have unlimited access). Click on three hidden xp places in there:

1st dancer up to the left.
Bottle on the floor underneath her.
2nd dance up in cage to the right.

If a bubble appears over the heads of the two patrons, go to the bar and buy a drink then ask bartender for gossip. She will give you the name of one of the patrons. Then click chat with that person. Hopefully they will give you an option to either, guess their name or ask them their name. ALWAYS choose guess. You have a 50-50 chance if the bartender didn't give you their name. If you get it right, then you get a mini xp boost and a big one as well. If the person is an A or B lister, add them to your contacts.

OK...so now invite one of your friends out on a date to the club. When they get there, CANCEL THE DATE. When you do, two different patrons will appear. You now potentially can meet two more people and guess their names and grab more xp.

I do this when my energy is out and I don't feel like running around anymore. If the person is a below a B level, I do not call them to add to my list. I just take the xp and dismiss them!