"We will be giving away a scone and cream with every beverage purchased."
Pirie said she had been hunting out decorations and Clarke's Bar would be "all decked out for the occasion".
"It's free for all, to just come along and enjoy the wedding together.
"Please come along all dressed up."
As for what Meghan Markle would be wearing on her big day, Pirie expected it to be something in a similar style to Catherine, Duchess of Cambridge on her wedding day.
"I just love the build-up, seeing what everyone is wearing, who's going to be there, all of the famous faces.
"There's always that little bit of drama."
The details
What: Screening of the royal wedding
Where: Novotel Rotorua, Clarke's Bar
When: Saturday, from 9pm
Cost: Free scone with every beverage purchased