Learn Hardcore Arabic (Levantine): ازدحم المدخل قبل العرض المباشر. - The entrance became crowded before the live performance.

As written, ازدحم المدخل قبل العرض المباشر sounds much more like Modern Standard Arabic (MSA) or a formal written style than everyday spoken Levantine.

A Levantine speaker would usually say something more natural like:

ازدحم المدخل قبل العرض الحي
صار في عجقة عالمدخل قبل العرض المباشر
المدخل صار مزحوم قبل العرض

A few notes:

ازدحم is a formal verb.
In spoken Levantine, people often prefer expressions like صار مزحوم (it became crowded) or صار في عجقة (there was a crowd / it got packed).
العرض المباشر is understandable, but in speech العرض الحي may sound more natural for live show depending on context.

So: yes, a Levantine speaker will understand it, but it is not the most conversational Levantine wording.

What does ازدحم mean exactly?

ازدحم means became crowded, got crowded, or was congested/packed.

In this sentence:

ازدحم المدخل = The entrance became crowded

This verb does not mean someone crowded the entrance. It describes a state that developed in the entrance itself.

That is why a good English translation is:

The entrance became crowded before the live show.

It is different from a more direct verb like ملأ (filled) where someone fills something.