I recommend hunting Chromatic orbs (sell for 5 Donation Tickets(DTs) each)) or Ultima Reaper with Hit (range in price) during this event to gather enough DT to buy a c/battle. The general price is 25 DTs for a c/battle, but in my experience you can haggle it down a little bit. The next event you can hunt Mr. Nakas Business Cards very easily, which sell for about 5DT each as well, and sell fairly quickly. Keep an eye on the drops for current events, and ask questions about what's best to hunt and prices of things if you aren't sure. Cheers