With the proliferation of online social networking, there’s no shortage of ways to connect attendees and exhibitors pre-show. But a service by Whereoware, an online marketing solutions provider, not only facilitates setting up appointments and making connections before the show, but also purports to keep buyers and sellers connected — and making deals — long after the last truck has exited the convention hall. The service, an online catalog gallery, allows exhibitors to upload products and descriptions to the Web, where attendees can peruse them at their leisure before, during and after the show.