I'm not sure I'd worry too much. The allegation is so preposterous that I can't imagine any judge would agree.
Many years ago, a DP of mine was subject of a private prosecution for attempted murder, no less. The stupid man who brought the case could afford it, and that's pretty much the only criteria.
My DP naturally worried himself sick and it hung over us for weeks, but on the day the whole thing fizzled out. Because of course he hadn't tried to murder anyone (he hadn't touched the other man) and the judge was an experienced old buzzard who listened carefully and then told the plaintiff off for wasting everyone's time. My DP wasn't even represented. I was a witness.
Having read what you're accused of,. Venice, I really wouldn't worry too much. One of the things the court will consider is whether anything said at the event was of concern to the police and I can't imagine they'll get a yes. I can imagine the judge forced to listen to the meeting and being baffled as to what's supposed to be so offensive.
I appreciate that some judges aren't so reasonable, but I've been a witness three times and brought three claims to the Small Claims Court and all of the judges showed straightforward common sense. Not that anything will stop you worrying.
The only thing I would say is that if your legal aid barrister is crap you might do better to represent yourself. I was in a landlord and tenant dispute. Our legal aid barrister turned up at court having not read the documents. She was worse than useless.
I don't know whether your solicitor can represent you in a private prosecution. It would be a major advantage if they can.