Senior Sergeant Anthony Bond, of Dunedin, said police responded to reports of a man working at one of the Dunedin Craft Beer Festival stalls being assaulted about 6.50pm on Saturday.
A 20-year-old man attending the festival at Forsyth Barr Stadium ran towards the 19-year-old employee and picked him up off the ground.
He then dropped the employee onto his head which caused a severe concussion.
The two men were not known to each other.
The employee is still recovering from his injuries at home, Snr Sgt Bond said.
The 20-year-old man was charged with assault and intent to injure.
On Friday at 8.15pm outside the beer festival 26-year-old man approached a 30-year-old man and assaulted him.
The 26-year-old punched the man several times in the head and kicked him once he was on the ground, Snr Sgt Bond said.
Police were called and he was located a short time later.
The 26-year-old was charged with assault.
Both men will be in Dunedin District Court on Thursday.
