I've got the following data to display:
| ID | Participants | Start Date |
| 1 | John, Paul, Matthew, John | 24 Dec. 2010 |
| .. | ... | ... |
In the "Participants" column, the amount of possible participants per row ranges from 2 to 20. What concepts or UX best practices can be applied in order to show the data, but not clutter the display too much?