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My friends from San Francisco reserved a hotel room and we'll be staying there Friday night.  The thing is, they're taking the train to San Jose, and will take some time to get here.  I live a LOT closer to San Jose, and so I thought I'll be at the convention center and get some business done first, before they arrive.  The thing is, I'm taking the lightrail there, and will be lugging a small suitcase with me.  Is there a facility at the convention center where I can store things safely?