Complex sentence: Fontaine was a guest at RuPaul's Drag Con 2016, and RuPaul's Drag Con 2017, which will be held in New York.
Split into simpler sentences: Fontaine was a guest at RuPaul's Drag Con 2016. She will also be a guest at RuPaul's Drag Con 2017, which will be held in New York.