QUICK QUESTION: Advance Signups for games

The app I'm developing will support long term games where a group of fixed players will meet regularly. I would like to develop a feature where my users can create a signup page for the game in advance. Players will be able to sign up for scheduled games 1-2 weeks in advance. This sign up lobby pages won't need an actual room until the players meet at the appointed schedule to play together.

Sign up would be very simple, containing only the date, the room "ID" and the player ID who signed up and a few string values.

Now my questions is, is it ideal to create this advance sign up feature on Photon or would it be better to host this on another server?