What are the things that could be addressed at Paris Web 2015? 10th anniversary. I will add little by little what comes to my mind.
Sometimes sites are broken. There is WebCompat.com for helping to record, but what are the techniques for finding the right contacts? Learn how to find contacts on Web site. What is working, not working, maximize the chances to get the issue fixed. It's not 100% bullets proof, but it helps a lot to be more effective.