Yes, you can! If you have absolutely no clue how many kids to expect, you can always register in person after 630pm. We encourage people to register online so we know more accurately how many people to expect, and to also spread out the waiting around. But by all means, you can register in person at HQ on the Saturday. You can get a little bit ahead of things by filling out and printing out the Hike Group Information Card. We also have them at HQ in case you forget it, don't have a printer, or have too many questions that can't be answered on the website.