The festival commenced on Friday and was expected to continue through Sunday, but organisers decided to cancel the remainder of the lawsuit following the incident.
"We are moving with the exigency services, constabulary and the Health and Safety Executive arsenic they found the circumstances surrounding today's incident," the organisers said.
"We are incredibly grateful to everyone who responded, and to our teams and assemblage for the attraction they person shown 1 another."
Theo Saville, who was at the festival, said a "large woody sign" had collapsed adjacent the entranceway to a tented area.
Sussex Police is urging anyone with accusation astir the incidental to interaction them.
The Health and Safety Executive and section authorization had besides been informed, the unit added.
The Big Church Festival, which describes itself arsenic the UK's biggest Christian festival, was founded successful 2009.