N2 - At - In- On

My niece's birthday is _____ 23rd December.

The meeting will start __ midday.

Sam loves being __ the beach.

They like travelling __ holidays.

Summer doesn't work __ July.

The weather __ spring is really windy.

The children are staying __ a campsite this holidays.

They hate going back home __ Christmas.

Harper always has breakfast __ work.

Tony was __ a party when his nephew was born.