Verb "to organize"

[Soklong]

Hi my great teachers!!

Would you please tell me the original sentence of the one bellow.

Everything to organize the picnic has already been done.

For example, the sentence like: The letter mailed today hasn't arrived yet. This sentence originate from the one : The letter which is mailed today hasn't arrived yet,
right?

What about to organize above where does from?

Thankssssssss!

Soklong

[Mister Micawber]

.
Keep in mind that there is no 'original sentence'. Potential words of an utterance can be elided through the mutual understanding of listener and speaker. Perhaps:

Everything [needed/required] to organize the picnic...
.
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Native English teacher at Mister Micawber's

[Alan]

Hi soklong,

Everything to organize the picnic ...

could simply be: Everything you want to organize ...

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Soklong]

Thank teachers!

But I still woder if it is said to be from the sentence like you said:

[Mister Micawber]

.
This also is a reduced adjective clause. I had already reduced it a bit:

Everything [(that is) needed/required] to organize the picnic...

The extent of elision depends on how much the reader/listener can be expected to understand, I suppose.
.
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Native English teacher at Mister Micawber's