PORTLAND — A ceremonial groundbreaking for the $33 million renovation of the Cumberland County Civic Center will be held Wednesday.

The event will take place next to the Free Street entrance to the Civic Center at 11 a.m. Neal Pratt, the chairman of the Civic Center board, will lead the ceremony and will be joined by representatives of the renovation project’s architectural firm and contractor.

The renovation will add suites and premium seating to the arena, upgrade the ticketing and concession areas, improve the heating and cooling systems and enlarge and update the back-of-house areas, including the loading dock and locker and dressing rooms

The renovation will be done in phases, starting this month with work primarily focused on the northwest corner of the arena near the Free Street entrance.

County voters last fall approved spending up to $33 million to renovate the arena. The work is expected to be completed in early fall 2013.