Following is Niagara Sunday's weekly listing of upcoming public events held around Niagara County. If you would like your event included, send the information two weeks in advance to: Niagara Community Calendar, c/o The Buffalo News, 8353 Niagara Falls Blvd., Niagara Falls, NY 14304, fax to: 283-1691 or e-mail to: niagaranews@buffnews.com . Today