Character

*This dialogueーthrough pop-up chat bubbles onlyーhappens after you finish the event quest. All quest NPCs show up in the Gold Saucer with the Loporrits as a bonus. (You can pick up the event quest by speaking to Ollier in Ul'dah (9.4 , 9.2).

Loporrits - Entrance Square (5.2 , 6.6)
*No dialogue came up for me when I get near them.

Kyokyoroon - Cactpot Board (8.4 , 5.6)
Kyokyoroon: Sparklies! So many sparklies!

Lyngsath (CUL Guild Leader) - The Manderville Tables ( 7.1 , 7.8)
Lyngsath: Aye, now this is interestin'...

Rhoswen & Carvallain - Wonder Square (6.4 , 6.7)
Rhoswen: What in gods' name is keepin' the bastard!?
Rhoswen: An' after I went out o' my way to extend an invitation...
Rhoswen: Still he has the gall to spurn me? Bah! I've a mind to gut 'im the instant he shows himself!

Five seconds later...

Carvallain: The letter said that the duel was to take place here.
Carvallain: ...Yet it would seem my opponent is nowhere to be seen.
Carvallain: Anyhow, I have no time for this foolery. I will be on my way at once.

Wawalago (FSH Guild Leader) - Chocobo Square , Race Counter (5.9 , 5.1)
Wawalago: Why, the Gold Saucer's every bit as wonderful as I imaginedーmore so, even!