Chief Executive John Lee on Tuesday said the upcoming July 1 holiday is a special day that people should celebrate freely, while warning of potential "undesirable activities".

He also told reporters that he believed people would cherish the current safe and stable situation in Hong Kong.

"We hope that people will celebrate July 1 happily. At the same time, we have to stay vigilant against undesirable activities taking place, say for example, activities that hijack this important date," Lee said.

"We now have stability, our security is safeguarded. I'm sure people will look forward to the celebrations. Police will take into account the situation and make arrangements as necessary."

On the absence of demonstrations on July 1, the chief executive said there are many ways and channels for people to express their opinions.

Separately, Lee is set to lead a delegation of principal officials to Guangzhou on Thursday for an annual conference, with discussions on past achievements and future cooperation in areas such as innovation and technology, finance, and healthcare.

He said cooperation between Hong Kong and Guangdong would help contribute to the high-quality development of the Greater Bay Area, adding there were unlimited opportunities for both sides.