There will be a rare chance for the public to enjoy the facilities at the National Stadium when it opens its doors for the second Sports Hub Community Play Day on Sept 17.

Organisers are hoping to see a turnout of more than 16,000, after the first edition in June attracted about 10,000 participants to the OCBC Square.

Said Singapore Sports Hub chief operating officer, Oon Jin Teik: "The project has an entertainment lifestyle and sport aspect for everyone... We have integrated larger programmes so people can come together and feel a festival kind of atmosphere.

"This is significant because the National Stadium is typically reserved for big events like football matches or concerts.

"The opportunity for Singaporeans to come into this stadium can be limited, so holding events like this opens it up for the public."

Organisers hope to hold a Community Play Day every quarter, with varying themes, such as a water-based one that involves the OCBC Aquatic Arena, the Kallang Basin and the Splash-N-Surf, a water playground for children.

Said Siva Krishnan, director of sports and community programming: "It's about showcasing our other facilities as well... We'll innovate and move around but, definitely, we hope to hold one at the National Stadium yearly."

The event boasts a myriad of activities that cater to all ages, free of charge.

One of the highlights this time is the Experience Sports programme, which aims to record the largest zumba crowd in Singapore. The session has already received almost 2,500 sign-ups.

There will also be a Sports Hub Community Fun Stepper event, which hopes to notch a million steps in the stands of the stadium throughout the Play Day. Minister for Social and Family Development Tan Chuan-Jin will kick-start the challenge at 9am.

Other activities include a family fun zone with inflatables and bouncy castles, sports clinics and tryouts for speedminton, netball, frisbee, dodgeball and basketball.

Traditional kampung games, such as chapteh (feathered shuttlecock) and gasing (spinning top), will also feature if participants are feeling nostalgic.

There will even be a flea market with stalls selling things from clothes to designer watches.

Several national footballers, joined by Lions caretaker coach V. Sundramoorthy will be there for a meet-and-greet session.

The Singapore Slingers, the local professional basketball team, will also be present, training on a court set up on the stadium's pitch.

Organisers have even jumped on the Pokemon Go bandwagon and will be setting up lures at the PokeStops in the area. In fact, the 55,000-seater stadium is a designated Pokemon gym, where trainers can battle it out while enjoying the festivities.

Pokemon Go fan and student Cheah Qinrong, 21, intends to turn up with her family and friends. She told The Straits Times: "My mum is also an avid fan so I look forward to going with her and playing games both physically and virtually."