Both are correct.
It's a matter of context, however both could be used interchangeably.
To help stress you may not be the only one, examples could be:
League Bowling happened in 1991.
League Bowling was created on 1991-07-01.
Revolutionary Anarchist Bowling League ended in 1991.
The name of the bowling league where players play individually is called a singles league.
The duration of Bowling Revolution P-League is 1800.0 seconds.
Are there any samples of League Bowling Prize Fund Sheets?
Bowling Revolution P-League was created on 2006-04-02.
youth bowling league
You must have a minimum of 4 teams. Contact the bowling center regarding scheduling. For sanction play, contact the local bowling association for the league application and a copy of the bowling rules. Develop a set of league bylaws, using the bowling rules as a guideline. Purchase a league management software, such as CDE Software's BLS bowling league secretary software to track the scores, standings and statistics as well as financials.
Most league bowlers own their own bowling shoes.
That would be a Scratch League.
Open bowling is either before or after league bowling. Call ahead before going to the bowling alley.