It is a little tougher than you are acknowledging due to the age of the participants (minors), and confidentiality agreements of settlements.
I am not a lawyer, but as someone who has been in insurance their entire adult life, I can tell you that everyone gets sued when the lawsuit hits.
For an example of a case:
Case opinion for CA Court of Appeal JANE DOE MINOR v. UNITED STATES YOUTH SOCCER ASSOCIATION INC. Read the Court's full decision on FindLaw.
caselaw.findlaw.com
Excerpt:
"...Fabrizio also spent extensive time alone with plaintiff on June 11 and 12, 2011.
He drove her alone to and from a tournament in Santa Cruz, even though her parents attended 30 minutes of the final game. During the tournament, Fabrizio took plaintiff alone for two walks. After parents and girls speculated about whether there was romantic or sexual activity between plaintiff and Fabrizio, plaintiff became upset by the girls' comments and told the coaches and the team parent, T.B. M.R., a coach, asked plaintiff whether she and Fabrizio had engaged in a sexual act. The coaches later held two team meetings to discuss the comments and tried to get the girls to apologize to plaintiff..."
I added the emphasis. The tournament organizer may have been let off at some point, but I have not doubt they were an original party to the lawsuit and incurred defense costs.