“It's falling on a Thursday this year.”
You're planning what to do for your Christmas holidays this year. You look at a calendar to see what day Christmas is and tell your girlfriend.
It's falling on a Thursday this year.
You can use this phrase to talk about which day of the week a holiday occurs on:
My birthday falls on a Saturday this year.
Sometimes when the Fourth of July falls on a Tuesday or Thursday we get an extra day off in addition to the holiday itself.
You can also say that the holiday "is falling on" a day of the week:
It looks like Halloween is falling on a Wednesday.