My mother came to pick me up at the food fair yesterday. We were packing the leftovers and cleaning up the tables.

While my mother was picking me up at the food fair yesterday, we were packing the leftovers and cleaning up the tables.

We were packing the leftovers and cleaning up the tables at the food fair yesterday when my mother came to pick me up.

We were neither packing the leftovers nor cleaning up the tables when my mother came to pick me up at the food fair yesterday.

My mother came to pick me up at the food fair yesterday, and then we packed the leftovers and cleaned up the tables.