Signed up：Bob、百辰、Mi、Summer、Teresa、Mark、Tina
Just a nickname, your gender and an email. Once payment goes through, it shows up on this session's list.
1–20 characters, shown publicly on the sign-up list.
Used to sort out on-court groupings. Not shown on the list.
We'll use it to reach you if the session changes — it's also how you'll sign in later on.