convivium
n.— «Miami and Tallahassee have chapters, which the Slow Food folk refer to as conviviums. I guess it is slower and more impressive to say than “chapter.” And the plural “convivia” clearly has more cachet than “chapters.”» —“Central Florida sets a great table: Pull up a chair and dig in” by Heather McPherson Orlando Sentinel (Florida) Dec. 27, 2006. (source: Double-Tongued Dictionary)