AT or ON, whichever you prefer. Usually Americans prefer ON and Brits go for AT, but it really doesn't matter. What do New Zealanders prefer? Any New Zealanders out there? And what about South Africans? Which do you use? Canadians I assume go for ON. Am I right?

"At the weekend" is used in the UK. "On the weekend" is used in Australia and the US.

Yeah either one is correct. I use on weekends because at weekends just doesn't come natural to me. It sound kind of weird but it alright with way.

on