will go

[Will17]

Hello!

I think the use of "will" in B's question is not really appropriate but is it a real mistake, please?

A: I'll be on holiday from 12th to 25th August.

B: Oh great! Where will you go?

Thank you
WIll

[curates-egg]

Hello!

I think the use of "will" in B's question is not really appropriate but is it a real mistake, please?

A: I'll be on holiday from 12th to 25th August.

B: Oh great! Where will you go?

"Where are you going?" may be the more expected response, but your version is not a real mistake; in fact, it is not any form of mistake.