General Comment (#17) on article 31 or use http://bit.ly/1kAjGpZ
Article 31 of The Convention on the Rights of the Child
1. States Parties recognize the right of the child to rest and leisure, to engage in play and recreational activities appropriate to the age of the child and to participate freely in cultural life and the arts.
2. States Parties shall respect and promote the right of the child to participate fully in cultural and artistic life and shall encourage the provision of appropriate and equal opportunities for cultural, artistic, recreational and leisure activity.
IPA Video on a Child’s Right to Play