I don't know. They were pretty vague about it.

[ Venti is no fool. To believe children had some mythical, long-coveted treasure map? No, no. He's been around vividly imaginative children in Mondstadt – he believes the Liyue children are no different.

Venti takes his chopsticks and taps them for good luck before snacking away. ]

But, it sounds like a steal. A day following clues, ending up in far off areas, uncovering lost lore and legends?

[ It'll get them away from drinking for the day, that much was for certain. ]