[citation needed] In August of each year, the NBBA sponsors a national and international invitational tournament.
[citation needed] The 2007 World Series, as the August invitational is known, was held for the first time in a city that hosts no beep baseball team, Rochester, Minnesota.
[citation needed] The 2018 World Series took place in Eau Claire, Wisconsin,[1] and the 2019 event is scheduled for Tulsa, Oklahoma.
[2] Beep baseball is said to have a "strong following" in France, Germany and Italy, and a taster event was organised at Farnham Park, England, in 2013 by BaseballSoftballUK.
However, the NBBA has a rule that, if a team cannot field the minimum six batters required to fill its lineup card, it may opt to allow up to two sighted volunteers to blindfold themselves and play as the players with visual impairments do.
The bases are blue, nearly 5 ft (1.5 m) tall, and have mostly foam interior with electronics that cause it to buzz steadily when a switch is thrown.
If a batted ball travels at least 170 ft (52 m) in the air over fair territory before settling, it is, upon declaration of the umpire, a home run.
In the rare event that a fielder catches the ball in the air before it touches the ground or other items, the side is automatically retired and the next half-inning commences.