We arrive on the 24th (Saturday) and then leave on the 28th (Wednesday). The concert isn't until the 27th, so the 24th should be great for a catch up.

The 26th is also Australia Day, and I think there's a big "Australia Day Spectacular" at Darling Harbour with fireworks. That sounds like it should be fun, and you guys are welcome to join us then too if you're free. :)