Checkpoint system
Implement a checkpoint system:
- From the event detail page, link to the checkpoint view
- On the checkpoint view, allow entering a checkpoint comment (e.g. "Abendessen" or "Zähneputzen")
- Allow entering a username or scanning a badge
- Upon submitting, note the checkpoint
Checkpoints do not need to be created in advance, they are created on-the-fly depending on date and comment