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.
Commonly Misused Words
secondly / thirdly
Do not use - there is no "firstly." Use first, second, third.
SOURCE: Hamilton College Editorial Style Guide