N2 - At - In- On

My niece's birthday is (a)   23rd December.

The meeting will start (a)   midday.

Sam loves being (a)   the beach.

They like travelling (a)   holidays.

Summer doesn't work (a)   July.

The weather (a)   spring is really windy.

The children are staying (a)   a campsite this holidays.

They hate going back home (a)   Christmas.

Harper always has breakfast (a)   work.

Tony was (a)   a party when his nephew was born.