"Which day of January is the show date?"
Translation:ʻO ka lā ʻehia o Ianuali ka lā hōʻike?
With the use of (ʻO) in this case, the arrangement of the sentence can be switched without the basic meaning being changed.
Which day of January (is) the show date?
(ʻO) ka lā hōʻike / ka lā ʻehia o Ianuali? or (ʻO) ka lā ʻehia o Ianuali / ka lā hōʻike?