Most people and plants talked about on this sight are American plants, represented by the IUAW, your plant is represented by the CAW. There is some similarity between the 2 agreements, but a great number of differences. Article 20 of the CAW agreement talks about hours of work and overtime. Basically in Canada we do not normally work production on the weekend, do yourself a favour and read this article fully and do not just cherry pick a few phrases or words and think you know it. After that ask your union rep. Yes we have had a few manditory Saturdays but quite a long time ago. Also check Appendix L starts on pg, 179 of your agreement,(can be linked from your locals web site)