Events take place during Holidays and generally supply the player with unique items during that certain time period, as well as introducing unique maps/bosses into the game. After these Events have passed, it will be impossible to ever get their items, so it is recommended that they are used wisely or stored for eternity.
Christmas Event 2015 (Pre-Demo — v0.0.8)
Release Event 2016 (v0.6.1 — v0.7.0)
Halloween Event 2016 (v0.8.0 — v0.8.4)
Christmas Event 2016 (v0.8.7 — v0.9.2)
R2DA Halloween Event 2017 (v1.0.4 — v1.0.6)