Lateness at a wedding

The invitation said 6.30pm.
People started rocking up at 8pm.

This is the usual occurrence at a vietnamese wedding.
The guests for whatever reason have no concept of:
-time
-etiquette

And frankly its rude and disrepectful to the couple and all the other guests who have managed to be there on time.

If people are going to be that late to a wedding, then they are better off not coming.
And who do they think they are to make everyone wait for them?
Its disgusting and tardy behaviour.

Its shameful and its been going on for qay too long.
Its time this behaviour is stamped out altogether.