abspielen
to play
To play back an audio or video recording using a technical device.
Kannst du bitte mein Lieblingslied abspielen?
Could you please play my favorite song?

to play / happen
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to play
To play back an audio or video recording using a technical device.
Kannst du bitte mein Lieblingslied abspielen?
Could you please play my favorite song?

'Abspielen' (to play / happen) is a separable verb. The prefix 'ab' comes at the end in a main clause. In subordinate clauses or in the infinitive with 'zu', the verb stays together.
Er spielt die Sprachnachricht noch einmal ab.
He plays the voice message again.
You can recognize the meaning from the context: With media (song, film), it means 'wiedergeben' (to play back). As a reflexive verb ('sich abspielen'), it means 'geschehen' (to happen). In sports, with 'Ball' (ball) as the object, it means 'weitergeben' (to pass on).
Ich kann die Datei auf meinem Computer nicht abspielen.
I can't play the file on my computer.
In the meaning 'wiedergeben' (to play back), the typical objects are media formats such as 'ein Lied' (a song), 'eine CD' (a CD), 'ein Video' (a video), 'einen Film' (a film), or 'eine Playlist' (a playlist).
Können wir auf der Party deine Playlist abspielen?
Can we play your playlist at the party?
In the meaning 'geschehen' (to happen) or 'stattfinden' (to take place), the verb is always used reflexively: 'sich abspielen'. The subject is the event itself.
Im Stadtzentrum spielte sich eine Demonstration ab.
A demonstration took place in the city center.
When passing the ball to a teammate, you can express this with the dative or with 'an' + accusative.
Er spielte seinem Mitspieler den Ball zu.
He passed the ball to his teammate.
to happen / pass
'passieren' and 'sich abspielen' can both mean that something happens. 'passieren' is more general and only says that an event takes place. 'sich abspielen' is more suitable when you mean a whole scene, a sequence of events, or several connected things. The place or background is often mentioned too. You can say: 'Etwas passiert' (something happens), but 'etwas spielt sich irgendwo ab' (something plays out somewhere).

Die Szene spielte sich direkt vor dem Bahnhof ab.
The scene played out right in front of the train station.
Am Abend ist im Hausflur ein Streit passiert.
In the evening, an argument happened in the hallway.