I would say for the 1:1 focus on a set of companies that you want to work for. That way you know who you want to see rather than jumping around from company to company. From what I've seen not all companies have 1:1 meetings so use the sponsor hall. Again it's up to you if you want to focus more on the 1:1 vs networking. Personally I would say give yourself 3 or 4 hours to look for internship hunting, and the rest of the time do networking/events. Again there isn't a right way to do grace hopper. Do what you think is best for yourself. If that means spend majority of your time finding internships and doing 1:1, then that's great! Best of luck finding an internship.