Bagel Friday is not just a food or even just a day. It is a mindset. 

I started having two bagels at 8:30 a.m. on Fridays during spring 23' to motivate me through my macro economics class. Macro Economics is not for me but I do believe it is an important class, so most of the time....I was there. But to get me there as the semester went on I needed a motivation and that was bagels. 

By luck and or circumstance my mood was greatly improved after I had my bagels. So it continued, and following the bagels I would follow all of my heart's desires that Friday.