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Rendle's Big Day
Help Rendle find the following hats to wear to the Ember Court.
Rendle's Big Day is a 5-point achievement earned by helping Rendle find four different hats to wear to the Ember Court, obtained by turning in crafted hats as part of his RSVP quest chain.
Unlock Rendle's Guest Slot
Unlock the third guest page for the Ember Court — Rendle (and Cudgelface) becomes available to invite once you reach that milestone.
Obtain the Four Hats
Acquire all four hats needed for the achievement: 
Crown of the Righteous, 
Fae Revel Masque, 
Pink Party Hat, and 
Red Noggin Candle — each can be purchased from the Auction House if you prefer not to craft them.
Turn In Each Hat Separately
Invite Rendle to the Ember Court and turn in one hat to him to earn RSVP credit and achievement progress; you can turn in one hat, receive credit, abandon the quest, then immediately retake it and turn in the next hat — all four can be completed on the same day without waiting for additional Ember Court events.
Tips
All four hats are available on the Auction House, so you can purchase any you cannot craft.