A fireworks display capped off a three-day rugby extravaganza at the Kai Tak Stadium on Sunday, bringing an end to the Hong Kong Sevens at its new home.

Chief Executive John Lee, who was there with his wife, said he had a great time with tens of thousands of fans.

"The first major tournament at the Kai Tak Stadium has successfully 'scored a try'," Lee wrote on social media.

"Next, let's wait for more exciting sports and cultural activities to take place, giving full play to the venue's enchantment, while looking forward to future mega events one after the other."

More than 38,000 spectators were on hand for the third and final day of the Sevens, according to organisers, with total attendance topping 110,000 visits over three days.

The Transport Department said overall traffic conditions were mostly smooth after the event drew to a close.

Spectators were advised to take the MTR by going to either Kai Tak or Sung Wong Toi station.

There were also special bus routes, as well as a number of taxis to pick up passengers.

Meanwhile, some fans complained on Sunday that they could not get food, with some stalls and vendors said to have run out of supply.

During a tour of the venue in the afternoon, culture, sports and tourism minister Rosanna Law said she had told operators to enhance their food supply services.

She also said the atmosphere and operations at the venue were very good in general.