He's not going to attend, I would eat my hat if he did. The case will proceed in his absence (as it's a civil case) she will be awarded and he won't pay a penny of any award made. He likely will never travel outside of the UK again in case of extradition.
However the palace pr machine will spin it that an awful American court never gave him a chance to defend himself, and how could they find him guilty when he was not even in court? So much bullshit will be thrown around to confuse everyone that he will slither away. I also expect many stories to be printed that Meghan Markle caused global warming, food shortages and is the person responsible when you put a pair of socks into the washing machine yet can only find one sock when the spin cycle is completed. Readers of the daily fail, the scum, etc will swallow all this down as fact and continue to spout that it wasn't rape as Roberts was 17 at the time, even though age of majority doesn't come into account when a person is sex trafficked, you can be 8 or 80 and be sex trafficked doesn't matter what the age of consent is. Everyone will wave flags about for the Queen's next event and everything will be forgotten and proceed as usual.
And for those of you saying he did or didn't have sex with an underage Roberts, it's not having sex with her, it's rape when the other party is a minor or victim of sex trafficking.