I thought it'd be a neat idea to have a convention center that's like a base, in that devs can give one player per month (or whatever) the opportunity to set it up for different events. A home and garden expo, cars, technology, supers-oriented, etc., etc. Maybe even allow some random stuff so people can show off base building skills. It'd certainly be easier than having people tromp through personal or SG bases to see some cool things, plus it'd provide a bit more variety and life to the city.
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Support trap clowns for CoT!