If nothing else pans out, can you get to BART? I will be in Pleasanton in the 2ish range tomorrow and could arrange to pick you up at BART there. Worst case, Concord BART is not far from site and if you can't take a cab (no clue what the costs are) from there to the hotel, you can call me and I'll come get you. 510-776-6265. Cellphone will be on me.