I saw my grandmother in Mexico this summer.

I swa Santa at school today.

I saw her for a few minutes.

I want to see you.

Are you going to see Sally tomorrow?

I am seeing somebody.

I ran into Tom today.

I saw Shiraishi at Gallileo Office today.

I hope I don’t run into my boss.

see は一般的な「会う」
meet は会うことを予定していて「会う」