Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
TechEvents.co - Tech and startup events aggregator
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Event Hunt - Startups and Tech Events Curated By Locals
OwnTracks - Cross-platform location sharing
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.