Question

در آستانه نشست اپک

Answer 1

in the run-up to...

 

Comments

Very nice.+1

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My pleasure!

Answer 2

on the eve of OPEC meeting

Comments

http://dictionary.cambridge.org/dictionary/english/eve

the period or day before an important event

Mrs Clayton was speaking to Arab journalists in Paris on the eve of her visit to Egypt.

سایت سازمان ملل

http://www.un.org/sustainabledevelopment/blog/2015/11/on-eve-of-un-climate-conference-ban-says-time-for-action-is-now/

On the eve of the opening in Paris of the United Nations climate change conference

Answer 3

On the verge of OPEC convention......

Answer 4

On the brink/verge of OPEC (Organization of Petroleum Exporting Countries) meeting/session/gathering/convention.

Comments

Organisation of Petroleum Exporting Countries (OPEC)

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Thanks for the reminder!

Answer 5

on the threshold of OPEC meeting