Barring orders for at least 32 of 89 gang members expire tomorrow and there are no plans to automatically reissue them.
The end of the bans - initially implemented to protect families enjoying a night out at venues - coincides with Adelaide celebrating its busiest time of year with the Fringe and Clipsal 500, which starts next week.
The men, predominantly members and associates of the Finks and Hells Angels motorcycle clubs, have been banned from licensed venues as part of Task Force Alpha investigations into the unsolved November 21 shooting murder of Jason De Ieso at his Pooraka workshop.
Detective Superintendent John De Candia, officer-in-charge of the Crime Gangs Task Force, said any extension of the orders would be considered on an individual basis.
The venues named in the orders are all the hotels in the greater metropolitan area, many entertainment venue licences, selected restaurants mainly in the Adelaide, North Adelaide and Norwood areas and selected special circumstances licences.
Most of the remaining barring orders issued as part of Task Force Alpha expire on May 23.
Australian Hotels Association South Australian president Ian Horne, who raised concerns for the staff at hotels attempting to monitor and uphold the barring orders, said the hotel industry was now "totally in the hands of SA Police" on the issue.
"They are the ones who issued the warnings and issued the barring orders," Mr Horne said.
"The onus is on licensees, the bar person and duty managers to implement them. The test and the challenge now will be to communicate clearly who is in and who is out."
Det Supt Candia said any extension to bans would be considered "on an individual basis".
"Whilst some are due to expire, others are not and vary in length," Det Supt De Candia said.
Det Supt De Candia said, to date, police believe that the barring orders had been successful while in place.
"One outlaw motorcycle gang member has been arrested for breaching his barring order and there have been no incidents at licensed premises between the two gangs that have been reported to police or become known to Crime Gangs Task Force," he said.
"The orders have assisted Task Force Alpha by reducing the opportunity for outlaw motorcycle gang members to congregate and come into contact with other groups at licensed premises and potentially cause further problems for patrons and staff at those licensed premises," he said.
Police have also revealed Task Force Alpha, since it was launched in late November, has resulted in:
TWENTY-ONE arrests or reports of outlaw motorcycle gang members.
TWENTY-EIGHT arrests or reports of other associates.
THE seizure of eight firearms including a shotgun, machine gun, handgun and pump action rifle.
UNCOVERING 576 rounds of ammunition, a home-made pipe bomb, a taser, a ballistic vest, five batons and 31 cans of capsicum spray.
ISSUING public safety orders for Stereosonic and mixed martial arts events resulting in 83 orders being served.
Mr Horne said the AHA had not been notified of any incidents or issues arising from the barring notices.
A January 3 letter from Senior Sergeant David Casson, co-ordinator of the Licensing Enforcement Branch advises "police issued Barring Orders following the alleged murder of a male at Pooraka on November 21, 2012" and that SA Police were seeking to serve orders on more than 90 people.
SA's 34,000 hospitality workers were told to use the photo kit barring documents to identify and refuse the men entry or have them removed.