A massive attack was carried out by goons on a/the rally

[thehammer]

'A' or 'the' which one should I use.

1- A massive attack was carried out by goons on a rally against corruption, which was organised on 30th March in Lahore, Pakistan.
2- A massive attack was carried out by goons on a/the rally that was organised on 30th March in Lahore, Pakistan, against corruption.
3- A massive attack was carried out by goons on a/the rally on 30th March in Lahore, Pakistan, against corruption.
4- Sir, I want to inform you that some people made an attack on a/the procession of a religious organisation in kolkata on 30th march.(this was the only procession that carried out on that day. Other people know that. But the person whom I want to inform he may or may not know.)
5- Sir, I want to inform you that some people made an attack on a/the procession that was organised by a religious organisation in kolkata on 30th march.

 

[SoothingDave]

Same as any other use of the indefinite vs definite article. Is the rally something that was already mentioned, or is generally known to exist?

 

[Tarheel]

Perhaps:

A gang of thugs attacked a group of peaceful protesters at a rally against corruption on March 30, 2023.

 

[thehammer]

Same as any other use of the indefinite vs definite article. Is the rally something that was already mentioned, or is generally known to exist?

No it's not mentioned.

 

[Skrej]

Why didn't you capitalize the proper nouns 'Kolkata' and 'March' in sentences #4 and #5?

 

[Tarheel]

Perhaps:

They were marching peacefully when they were viciously attacked by a gang of thugs.

 

[Barque]

made an attack on

This isn't very natural.

"A massive attack was carried out" works but it's simpler to say "attacked".

 

[SoothingDave]

No it's not mentioned.

Then use "a/an."

 

[emsr2d2]

Why do you keep failing to capitalise "Kolkata"?