If that's all you have, that's all you have.
I don't see a point buying anything more just for a trip.
The main thing to me from reading some of your questions is that you got to get your fundamentals right instead.
Read up, shoot more now, review, learn, shoot more again.
If you can, join one or two outings on CS, to get a bit of one on one with more experienced shooters.
Your setup looks fine.
Personally, I'd usually bring a small flash, but its not a must, and you'd need to learn to use it last minute.
Make sure you bring enough storage for the photos and have a spare batt or two.
Beware of theft. Don't book tables with your camera bag.