Marking the occasion with a re-enactment of Council's first meeting in 1963, the special anniversary event will see the regular Wednesday meeting moved in a one-off to Friday at the CWA Hall.

Past councillors have been invited to join with current councillors and residents are encouraged to come along.

Mayor Tony McGrady said it would be a great opportunity for community members to experience a piece of Mount Isa's past and celebrate a notable milestone in the council's history.

"Hair was big, ties were loud and colours were psychedelic when this council met for the first time in 1963," Cr McGrady said.

"Fashions may have changed but council is still here and still going strong as we celebrate our 50th birthday and Mount Isa its 90th."

Cr McGrady said the minutes of the first council meeting will be read as past councillors and members of the public watch from the public gallery.

"It will be a fitting and novel way to mark our 50th and show how far the city has come."