When is Pat going to call you?
I' am expecting him to call sometime ______ the weekend.
a)in b)on c)over
When is Pat going to call you?
I' am expecting him to call sometime ______ the weekend.
a)in b)on c)over
In this case, none:
I expect him to call sometime this weekend.
That said, on and over apply where one's weekends are concerned; and if you wish to be all cute (or all formal) about it, then "in the course of" might just do the trick. Not always, though.
I'll get to it on the weekend.
I'll be working on it over the weekend.
Or, upon @JEL's suggestion:
I'll be working on it during the weekend.
Pronounced "DOO-ring" or "DEW-ring," depending on the neighborhood.
Another suggestion from Relentless JEL is:
I'm expecting him to call sometime, come the weekend.