For me it’s a bit strange that you’ve broken out your “Talks” into three separate collections. My thinking would be to have just one “Talks” collection, with a new field added, that tags each talk item listed with either “May 15th”, “May 14th”, “May 13th” (then you could always filter by that talk date if need be).
Then on your Bio page you add a Collection List element, bind it to the “Talks” collection, and add a Visibility Filter along the lines of “Display when Speaker Contains Current Speaker Bio”.
If all of that does indeed work… then accomplishing this with your existing model would be to follow the exact same steps above, but instead add 3 collections lists, one for each of the 3 “Talks” Collections.