F***** Marathonstrecke

I’m scheduled to go to Berlin next week and study some fossils for my dissertation. Unbeknownst to me until the past few days, when I was unable to book a single hotel room in the entire German capitol that was recommended by Lonely Planet and cost under 60 euros, the Berlin marathon is taking place next weekend. Am currently looking on-line for hotels. Does anyone happen to have any friends/family in Berlin? I am a very good guest. I have a sleeping bag, mattress pad, and will do dishes and/or light housework.