Syafi’i , A.A., Bengang, E., Wulandari, F. and Ladopurab, H.H. 2020. Implementation of the Green School Festival to Increase Strengthening of Character Education in Era 4.0. Proceedings of The ICECRS. 8, (Jun. 2020). DOI:https://doi.org/10.21070/icecrs2020450.