Adrianne Landsman, 56, of Edgware, north London, was charged with child neglect at LL Camps of Borehamwood.
Larry Lewis, 55, of Borehamwood, faced one charge of perverting the course of justice.
The prosecution at St Albans Crown Court said it was discontinuing the case against the pair.
The case will continue against Ben Lewis, 25, of Lullington Garth, Borehamwood.
He is the co-founder of LL Camps and is accused of two charges of perverting the course of justice, one charge of child neglect and three counts of possessing indecent images of children.
LL Camps' other co-founder, Tal Landsman, 25, of Stevenage, is accused of child neglect and conspiracy to pervert the course of justice.
LL Camps ceased trading when its registration was suspended in August this year.
Two people accused of offences related to allegations of abuse at a US-style children's camp in Hertfordshire have had the case against them dropped.