In the past few weeks, Mitchell said he had slowly regained a “bit of movement” in his limbs.
An online fundraising page, external, set up shortly after his accident, has so far raised almost £6,000.
The 24 hour wrestlethon, external, being held at the home of WAW on Diamond Road, began at 15:00 GMT on Saturday.
“It’s not a show per se. People can just come in, give us a tenner and stay as long as they want,” said WAW co-owner “Rowdy” Ricky Knight.
“The response from other wrestling companies has been amazing,” he said.
“We’ve got a lad coming over from Ireland, Italian wrestlers, someone from North Wales, Hull and Lincoln – they’re all sending people down.”
