In that scenario we'd look at "the Saturday afternoon" or "the Friday night time", with an implicit "of the function". Consistent with what Kyle explained, we could only say "on" Using these, not "in". as promo stuff I heard was stickers etc offered out by Flickr mid final decade, as https://simonfufnv.blogtov.com/17048183/considerations-to-know-about-apply-free-phone