Loading view. There were no results found. There were no results found. Events Mariandale Retreat & Conference Center Mariandale Retreat & Conference Center 299 North Highland Avenue Ossining,NY10562United States Get Directions 914-941-4455 x119 Today Now onwards Now onwards Select date. Previous Events Today Next Events Subscribe to calendar Google Calendar iCalendar Outlook 365 Outlook Live Export .ics file Export Outlook .ics file