听力原文：Jeremy runs into a problem. He intends to hold a conference for online gamers about 500 attendees. He has set up all the arrangements such as location and accommodations based on this number. But over 200 people have registered than expected. It will be overcrowded and he will be penalized by the online gamers association. Jeremy wanted to get in touch with them to ask for help, but nobody responded. He thinks of selecting people from the registers to take part in extra sessions, but this will not fix the problem. Now he is watching nervously as the attendees are arriving. What problem does the speaker mention?