1) Group at the lanes 
A bowling league is a group event where several teams bowl against each other over the course of a season. Most bowling leagues consist of four team players that meet up once a week or once every other week, usually at the same day and time. Teams of three or five players are also common. Leagues can be set up as male-only, female-only, or mixed. ...
[n] - a league of bowling teams
noun a league of bowling teams