Although it's part of the RSA building, the Fox Hole Cafe is open to the public and can be accessed by a door opening directly off St Hill St.
"It's the only cafe on St Hill St so we're hoping our customers will be the businesses along St Hill St," Mr Dalton said.
The initial opening hours will be 8.30am-3pm, Monday to Friday, but he said these were open to change depending on how well the cafe does.
Mr Dalton said club members and non-members alike were welcome at the open day.
At 11.20am the presentation will be made to this year's two winners of the Eric and Zita Lawrence Trust scholarship, awarded to a Whanganui student in their first year of university.
Between 11.30am and 1.30pm a $5 buffet will be held, and at 1pm there will be live music. All day people can try out darts, 8-ball, indoor bowls, housie and Texas hold 'em poker.
"The open day is for everyone. We want people to come and have a look at what the RSA offers," Mr Dalton said.