Hamilton to Host International Writers Festival - Novelist/poet Chris Abani, Pulitzer Prize-winning poet Vijay Seshadri and Valzhyna Mort will participate in the festival on Friday, Feb. 27, and Saturday, Feb. 28.
plural names ending in s
Add "es": Charleses, Joneses, Gonzalezes. Do not use an apostrophe to form a plural.
SOURCE: Hamilton College Editorial Style Guide