Michael Carroll, 22, and four friends caused havoc when they burst into a Christian rock concert in Downham Market, Norfolk, in May 2004.
Two of the concert-goers required hospital treatment while other young Christians prayed for their lives, after the youths, two with baseball bats, ran amok. One of them has never been identified.
Carroll, a former dustman who won a £9.7 million jackpot just over three years ago, and his friend David Howard, 24, pleaded guilty to affray last month. Howard's brother Paul, 19, admitted the charge at an earlier hearing and was jailed for six months.
Last month, the court heard that the trio, armed with the bats, invaded the concert after two teenage girls they knew had been involved in a row outside the town hall. The girls, who cannot be named, each admitted a charge of threatening behaviour.
Only eight months ago Carroll, who has homes in Downham Market and Swaffham in Norfolk, said he was "turning over a new leaf". In June, he told journalists that he was changing his ways and calling him a "lout" was wrong. "I don't want to go back to prison," Carroll said. "I ... want to get on the straight and narrow path."
Carroll was speaking three days after magistrates in King's Lynn made him the subject of an anti-social behaviour order after hearing that he caused more than £3,000 worth of damage by catapulting ball bearings through car windows as he was driven along a road in a black Mercedes with the number plate L111 OUT.
In July 2004, Carroll was given a five-month jail term after breaching a drug treatment and testing order imposed when he was convicted of possessing cocaine.