I think the key aim in such environment is to facilitate information exchange, not to structure & store the conversation as there is no time really - that makes

I think the key aim in such environment is to facilitate information exchange, not to structure & store the conversation as there is no time really - that makes notepad, post-its and just on-going verbal conversation ideal as everything is due to change many times during these 54 hours. The only technical tools that can help might be google docs to polish marketing docs on sales and strategy, and dropbox/github to exchange files. Everything else is just you and them - staying focused on getting things done, working together hard. Good luck!