Tonks would've given any information she had about the Ministry attacks, though Bill and Fleur would've likely covered the brunt of it.
She brought up the four backstage passes she had, saying she was going to drag Charlie and suggesting two other people in their age group - Bill, Fleur, or Hestia - would likely be best to come along so they didn't look suspicious. She also suggested they come up with a plan to get as many people out of there as possible in case something did happen, potentially involving Apparating or Portkeys, if possible.