The seven people killed in the crash were lorry drivers Terry Brice, from Patchway, South Gloucestershire, and Kye Thomas, from Gunnislake, Cornwall; father and daughter Michael and Maggie Barton, from Windsor, Berkshire; grandparents Anthony and Pamela Adams, from Newport, South Wales, and battle re-enactor Malcolm Beacham, from Woolavington, near Bridgwater, Somerset.
The inquests into their deaths will be presided over by West Somerset coroner Michael Rose.
The motorway was closed between junctions 24 and 25 for about 48 hours, reopening on Sunday evening.
Police investigating the cause of the crash are treating the nearby fireworks display, staged at Taunton Rugby Club, as a "major line of inquiry".
Detectives have appealed for any amateur footage of the fireworks or the crash scene to be sent to them.
A vigil due to be held by the local community next to the scene on Friday, a week after the crash, will now not be open to the public.
Police have asked people to stay away from the event at Sainsbury's in Hankridge because of fears too many would turn up.
Attendance will now be restricted to the emergency service workers who directly responded to the crash, and to those who have had personal invitations.
The hearings over the victims of the crash near Taunton are to be held at the town's Old Municipal Buildings.
Thirty seven vehicles were involved in the crash, with 51 people injured.
Police probing the cause are looking at whether smoke from a firework display held next to the M5 spread across the motorway, hampering visibility.