The Impact of Time-of-day Administration of EV/P on Objective Response Rate in Adults With Advanced Bladder Cancer

The goal of this clinical trial is to learn if the timing of treatments plays a role in how effective the standard-of-care drugs enfortumab vedotin and pembrolizumab (EV/P) works to treat adults with advanced bladder cancer. The trial will also learn if time-of-day reduces EV/P side-effects. Researchers will compare EV/P given in the morning (before 11:30am) vs in the afternoon (after 1:30pm), to see if circadian rhythm effects how EV/P works to treat advanced bladder cancer. Participants will be randomized in Arm A or Arm B to receive drugs EV/P either in the morning (Arm A) or afternoon (Arm B) as part of their standard-of-care treatment for advanced bladder cancer. Participants will: * Visit the clinic either in the morning (Arm A) or afternoon (Arm B) to receive EV/P treatment as part of their regular medical care for advanced bladder cancer * Frequency of visits will follow standard-of-care guidelines * Participants will be followed-up by the study team for up to 24 months.