China's stock rally could extend another 15% to 20%, Goldman Sachs says. China's equity indexes have jumped dramatically since Beijing announced major stimulus policies. Goldman highlighted still low valuations and diminishing risk as tailwinds for a continued rally.

The recent two-week rally sparked by the unveiling of the People’s Bank of China’s stimulus package has already seen one of the sharpest increases in Chinese equities in history. Goldman Sachs’ analysts said the rally could now have more legs.

The Shanghai Stock Exchange will close from Oct. 1 to Oct. 7 for the China National Day celebrations. Hong Kong’s market will be shut on Oct. 1.

Analysts say the difficulty for Chinese policymakers will be turning the opportunism-fueled rally into a broader recovery when markets reopen after the Golden Week holiday.

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The briefing, which is scheduled to start at 10 am, will include five senior officials from the National Development and Reform Commission, including Chairman Zheng Shanjie, according to a notice from the Chinese government on Sunday.