Star Wars: Knights of the Old Republic/Upper City Cantina

Pazaak
The entryway to the cantina is the Pazaak room, which has a Pazaak table in the middle of it. A door at the other end leads to the central hub of the cantina to the west, but there are three people standing around the Pazaak table, to all of which you can speak.

Christya
Christya is the closest to you, standing by the Pazaak table, to your left.

If you speak to her after losing any wager with Niklos:

If you speak to her after winning any wager with Niklos:

If your character is male, she then continues:

If she leaves for the tap room, when you follow her you'll find her speaking to the Tarisian noble mentioned later:

They leave the cantina together.

Niklos
Past Christya is Niklos, also standing by the Pazaak table, to your left.

Once you've bought a Pazaak Deck from Garouk, you can speak to Niklos again to play:

Garouk
Garouk stands at the corner of the Pazaak table to the northwest, on the opposite side to Christya and Niklos:

If you return to speak to him again, he opens with the following:

Search for Bastila
The western exit to the Pazaak room leads to the central hub of the cantina. Aside from nine Taris citizens, there is Sarna, an off-duty Sith officer, standing to the right as you enter and, if he hasn't left with Christya, a Tarisian noble standing to the right of her:

The music room is through an archway to the north, the bar is to the west and the lobby for the dueling arena, containing the Duel Organizer, is to the south.

Invited to a Party
If your character is male, you should speak to the aforementioned Sarna; if your character is female, you should speak to Yun Genda, another off-duty Sith officer, standing to the left inside the entrance to the music room to the North. The dialog for both is almost identical, with only the names changing:

At any point, if you end the dialog as follows:

You pick up where you left off as follows:

The Sith ends the dialog. Otherwise:

Once again, the Sith ends the dialog. If you try to speak again:

However, the following response prevents the dialog ending, or allows you to resume it:

You don't need to persuade either of them to get invited to the party in the North Apartments, directly opposite the entrance to Upper City North from Upper City South; just start with the sympathetic responses.

If your character is female and you speak to Sarna, or your character is male and you speak to Yun Genda, the following dialog for both is almost identical, with only the names changing:

If you try to speak again:

Jergan
The music room to the north hosts two Twi'lek dancers accompanied by three Bith musicians, with a couple of music room patrons and a couple of Taris citizens. Aside from the aforementioned Yun Genda standing to the left inside the entrance, there is also Jergan standing to the right.

If your character is male and tries to speak to him, the dialog is brief:

If your character is female, it's more involved and he will automatically speak to you as you enter:

The latter two responses end the dialog. Speak to him again to resume:

If you do take him up on his offer, he leaves with your twenty credits and an angry woman comes up to speak to you:

Trying to speak to either of the Twi'lek dancers suggests you didn't lose anything other than money (and dignity):

Gana Lavin
The bar to the west is frequented by a couple of Sith patrons, a couple of Taris citizens and a noble youth, all tended by a waiter. There is also Gana Lavin, standing by the south wall.

Carth interjects if he's present:

This is the only outcome that avoids violence once you walk out of the cantina. Otherwise:

She runs off and out of the cantina. Be ready for anything when you follow her...