Ereignis is not a further thing above and beyond Being, but is Being's own way of occurring.
Ereignis is translated variously as ‘event’, ‘appropriation’, ‘appropriating event’, ‘event of appropriation’ or ‘enowning’.
Ereignis is a term suggesting that we can never truly be detached from the world and become timeless, placeless observers. The world opens up for us only because we are engaged participants in it.
Ereignis is an event that is my own. In an Ereignis, beings find a significant place within my own life and world.
Ereignis is used just as we use the word "event". However, it echoes the adjective eigen, "own", which is the root of words such as Eigenschaft (property), geeignet (appropriate), and even eigentlich (authentic).
Ereignis is hindered by a tendency to think of it as being, when in fact it is essentially other than because richer than any possible metaphysical determination of being.