少年派素质教育中心线上植树节活动邀请函， inviting all little friends and parents to participate in the online planting activity on March 12th. The activity includes two rounds: the tree planting knowledge competition and the tree planting '消消乐'. Participants can compete and win prizes, while also learning about the importance of tree planting. The event is hosted by the Shanghai Youth League and aims to promote environmental awareness among young people.