From a personal perspective: I volunteered and got involved in Team 13. I met loads of great people and got to go to 9 different venues to watch games and take some friends with me.
Following the World Cup I was invited to be team manager for Wales wheelchair RL and I'm now in my second season helping the team with logistics, training events and competition games.
This led me to volunteer as the team manager for North Wales Crusaders wheelchair RL team - our aim this year was to hold a taster event (done) an mini-festival (done) and host all our league and cup games (done).
There are probably dozens of other stories like mine - and this is the real legacy.