Rioting broke out on Sunday 2 September, after a parade, organised by the Henry Joy McCracken Flute Band, marched from Duncairn Parade in the New Lodge area of the city to Henry Place near Clifton Street.
Loyalists objected to the Parades Commission not placing restrictions on the march.
Subsequently, more than 60 PSNI officers were injured during three consecutive nights of violence on streets close to Carlisle Circus.
As well as the guilty pleas at Belfast Crown Court, two 27-year-old men, Aaron McCrory from Argyle Court and Stephen Worthington from Faburn Park, both Belfast, denied taking part in the rioting.
Stuart McGrugan, 32 from Mallusk Gardens in Antrim denied attempting to cause grievous bodily harm with intent.
The arraignments of two other Belfast men, David Nixon, 24, from Cosgrave Heights and Colin McAuley, 30, from Glencairn Way were adjourned.
Pleading guilty to a single charge of riot were 23-year-old Jonathan Airdrie from Rosebank Street, Dale Mason, 25, of no fixed address, Philip Allison, 20, from Carnrae Bend in Rathcoole, William Beck, 26, from North Boundary Street, John Blair, 37, from Ross House in Mount Vernon, Alan Brennan, 29, from the Larne Road in Carrick and Andrew Campbell, 19, from Fernagh Drive in Newtownabbey.
Also pleading guilty to a single rioting charge were 34-year-old Judith Hawthorn from Florence Square, Simon Johnston, 28, from Donegall Avenue, Kenneth Kennedy, 29, from Sunningdale Gardens, Marcus Lamont, 23, from Ross House in Mount Vernon, James Mason, 28, from Queen's Drive in Newtownabbey, Kenneth Murphy, 42, from Eureka Drive, Jason McCormick, 39, from Enfield Street, Christopher McKay, 24, from Wallasey Park, Andrew McVeigh, 22, from Woodvale Park, Gareth Phillips, 31, from California Close, James Smyth, 19, from Tenant Street and 22-year-old Dean Watson from Shane Crescent.
Admitting a charge of intentionally encouraging a riot was 50-year-old Stephen Boreland from Lord Street Mews, while Logan McMullan, 20, admitted rioting in September but denied two further offences of resisting and assaulting police on October 4.
John Crossett, 47, from Berlin Street pleaded guilty to attempting to cause criminal damage to a police Land Rover.
Dale Mason also denied a charge of attempting to cause criminal damage to a Land Rover.
For those who admitted the various offences, Deputy Recorder Judge Corinne Philpott QC ordered pre-sentence probation reports and adjourned passing sentence until next month.
Trial for defendants who denied offences have been scheduled for January next year.