Lightroom 5 doesn’t have a direct equivalent to Aperture’s Event view. The closest built-in approach is to organize photos by capture time and use Lightroom’s existing grouping tools.

Two common ways to approximate it are:

• stack by capture time, so photos shot close together are grouped visually
• sort by date and build collections or smart collections based on date ranges or shoots

This won’t look exactly like Aperture’s event browser, but it can give you a similar workflow for browsing shoots as grouped sets rather than only by text labels. If your main goal is quickly locating images from a session, date-based sorting plus stacks or smart collections is likely the best Lightroom-native solution.