This is the 9217th most frequent Polish word.
tegoroczne
"Relating to this year's."
In this context, "tegoroczne" is used as an adjective describing the vacations ('wakacje') pertaining to this year.
Planujemy wycieczkę na tegoroczne wakacje.
We are planning a trip for this year's vacation.
Here, "tegoroczne" qualifies the harvest ('zbiory jabłek') specifying it as those of the current year.
Tegoroczne zbiory jabłek były bardzo obfite.
This year's apple harvest was very abundant.
In this sentence, the word "tegorocznym" (a declined form of "tegoroczne") describes the festival ('festiwal'), associating it with the present year.