As part of National Good Neighbor Day, Brock Cherry, the Great Falls Planning and Community Development Director will be at the Library to talk about future visions and plans for Great Falls. Time TBD. National Good Neighbor Day was first celebrated in the early 1970s by Becky Mattson who wanted to connect with her neighbors in Montana. It officially became a holiday in 1978, when President Jimmy Carter signed a proclamation to establish the holiday.