Peter Bialek, 66, of London Road, Salisbury, appeared at Winchester Crown Court for sentence having admitted three counts of wounding/inflicting grievous bodily harm without intent, and one count of causing bodily harm by wanton/furious driving.
The court heard that Bialek was under the influence of alcohol on Saturday, October 3, 2015, when he drove his silver Mercedes vehicle into the marquee, leaving 21 people injured, including three who were seriously injured.
Mr Justice Teare sentenced Bialek to 16 months in prison. Bialek was also disqualified from driving for 24 months.
After the hearing, PC Stephen Johnson, officer in the case, said: “Bialek chose to get behind the wheel that night, despite having consumed alcohol.
“His reckless act of driving into the marquee left many people injured, some seriously, and could have been much worse.
“The sentence given today should serve as a reminder that driving whilst under the influence can have catastrophic consequences. It really is not worth the risk.”