Hello, I am planning a wedding in Madrid on [date], with requested group photos such as [role-based groups]. Each group is expected to be available during [windows], with [groups] taking priority. Please explain who should gather people on site and who marks photos as completed. How will the session proceed when people are missing, who records outstanding groups, and how will any groups not photographed be reported at the end? This enquiry concerns coordination; the list does not mean every requested photo is guaranteed.