Related Clues:

• Join
• Appear
• Share (in)
• Be involved
• Join in
• Share
• Get in on the action
• Participate
• Join in the fun
• Join in, but help yourself only to some of it
• Become involved
• Participate, join in
• Join in and criticise severely, heartlessly
• ... so leave some presumably to participate
• React to scrap and join in?