I think you may see some posts from people who became aware of their acceptance on a weekend, either because they weren't logging in every day (in the case where no e-mail is sent), or because the e-mail sent by the school took forever to send for some reason. (For example, many Saskatchewan accepted have been getting acceptance e-mails at 2 or 3 am, so these could easily come technically on a Saturday).
So I don't think any admissions staff are actually sending offers on weekends (that would be a bizarre reason to work overtime), but due to various IT issues, it's not impossible that you will receive an offer on the weekend.
What school do you currently attend? Is it a full year course or just a single semester course? If you attend Western, according to this (https://www.uwo.ca/arts/counselling/procedures/adddrop/deadlines.html) you have until March 7th to drop a single semester course without academic penalty, meaning it won't show up on your transcript, it is like you were never enrolled in it in the first place.