As a product manager, the first step I would take is to analyze the data to identify the root cause of the decrease in RSVPs. I would look at various factors such as the timing of events, the type of events, and the target audience to see if there are any patterns or trends that can explain the decrease. Once I have identified the root cause, I would brainstorm potential solutions with my team. This could include changing the timing or format of events, targeting a different audience, or offering incentives to encourage RSVPs. After deciding on a solution, I would create a plan for implementing it and monitor the results closely. If the solution is successful, we can continue to iterate and improve upon it. If not, we can reassess and try a different approach. Throughout the process, I would communicate with my team and stakeholders to ensure everyone is aligned on the goals and progress. Additionally, I would leverage Facebook's resources and data to inform our decisions and ensure we are making data-driven choices. Overall, the key to addressing a decrease in RSVPs is to identify the root cause, collaborate with the team to find a solution, and continually monitor and iterate to improve outcomes.