Possible Clues:

• For the less well-known characters performing in Chips, for example, and Hawaii Five-O, for instance
• Doctor Who following teams — not the main event
• Secondary performance
• Reconstructed Swedish boxing ring is minor attraction
• Minor but diverting incident
• Attraction at a circus or carnival
• Team's method for event, not the main one
• Not the main attraction in area, plant storing hydrogen
• Exhibition subordinate to a larger one
• Activity subordinate to a larger one