What information does Mosaikin hold about me as a guest?
Your contribution, the name you chose to type, and a short-lived session for the one event — the Privacy Notice is the full account.
In everyday terms: the photos or messages you sent, any caption, whatever name you typed beside them, and a session for that one event that lapses after 24 hours. Guests are not asked for an email address, are not given an account, and are not signed up to anything.
Before your first upload you are shown a short consent notice saying exactly what will be stored and shown, and that record is kept with your contribution.
If you reply to an invitation, the host also receives the name you gave, whether you are coming, how many of you and any note — see How do I tell the host whether I am coming?. And your own phone keeps a download key and thumbnails of your own photos for up to 30 days — see Can I see my photos when I have no signal?.
This page is a summary, not the authority
The Privacy Notice is the complete and binding account of what is held, why, for how long and on what lawful basis, and the Guest Terms cover what you agree to by contributing. Where this page and those documents differ, they are right.