**Core Features:**

1. **Attendance Table**
   - A table with:
     - Rows: Each game date (in DD/MM/YY format).
     - Columns: Each player’s name (8 fixed names) and one column for a guest (labeled “Guest” or “Mystery”).
   - Each cell (except for the date) is clickable to mark attendance (“Yes” or blank).
   - The user should be able to adapt the name of the players.

2. **Add/Edit Dates**
   - Ability to add a new date (row) to the table.

3. **Mark Attendance**
   - Clicking a cell toggles attendance for that player/guest on that date.
   - “Yes” means attending; blank means not attending.
   - The user should be able to adapt the name of the guest.
   - The user should be able to adapt the name of the players.
   - The user should be able only to choose from Yes or blank to mark attendance. 

4. **Data Persistence**
   - The table’s state (who is attending which date) is saved and loaded automatically (from a JSON file).
   - No login or authentication needed (handled by your reverse proxy).

5. **Guest/Mystery Player**
   - The last column is always for a guest. You can leave the name as “Guest” or allow it to be edited per date.

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**What you don’t need for MVP:**
- User registration, login, or roles.
- Notifications, reminders, or analytics.
- Player management (names are fixed).
- Complex UI-just a simple table.

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**How it works (user flow):**
- User opens the web app.
- Sees a table with upcoming dates and player names.
- Clicks on their name under a date to mark themselves as attending (“Yes”).
- Guest attendance can also be marked.
- Data is saved automatically.

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**Technical outline:**
- **Frontend:** Simple HTML table, checkboxes or clickable cells, minimal CSS.
- **Backend:** JSON file for storing attendance.
- **No authentication logic needed** (handled at the proxy level).

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**Summary:**  
You only need a simple, editable attendance table with dates as rows and player names (plus guest) as columns. Users can mark their attendance with a click. No login, no user management, just a fast and easy attendance tracker.