I came across a site that lists "top 50 sensor applications for the smarter world". It actually list 58 applications partitioned to the following areas:: smart cities, smart environment, smart water, smart metering, security & emergencies, retail, logistics, industrial control, smart agriculture, smart animal farming, domestic & home automation, and eHealth.
I worth digging into the different areas to check the potential applications, and the role of event processing in each of them.