Duterte supporters gather at Luneta

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Metro Manila (CNN Philippines) — On the same day that the country is celebrating the 31st anniversary of the EDSA People Power Revolution, a pro-administration gathering started Saturday afternoon at the Quirino Grandstand in Manila.

Read: Anti-Marcos groups hold EDSA day protests

The Mayor Rodrigo Roa Duterte National Executive Coordinating Council (MRRD-NECC) organized the event. They expect around 1 million people from various pro-Duterte groups from different provinces in the country to show up.

As of 6 p.m. Saturday, organizers said the crowd had reached 400,000 people. The Philippine National Police National Capital Region Police Office estimated the crowd at 200,000 people as of 7 p.m. Saturday.

The organizers said the event is not a political display, but a show of support for President Rodrigo Duterte's war against illegal drugs, corruption and poverty.

"Just to reiterate people's support for President Duterte sa [for his] commitment to deliver the promise during the campaign," said Bobby Brillante from the MRRD-NECC. "The celebration in EDSA and Luneta should be complementing each other as a celebration of freedom."

Brillante also said despite the criticisms hurled against the Duterte, his supporters are unfazed because of the concrete actions they see in his administration.

The program will have speeches and performances by various artists, including entertainer and Movie and Television Review and Classification Board Member Mocha Uson, actor and Philippine Amusement and Gaming Corporation assistant vice president Arnell Ignacio and singer Freddie Aguilar.

The program is expected to end Sunday.

Simultaneous actions in Davao, Cebu

Meanwhile, a pro-administration action is also being held in Davao City.

Organizers said the Freedom Rally Against Crime, Corruption and Drugs is meant to counter the EDSA demonstrations deemed as "anti-Duterte" or critical of the current administration.

Around 5,000 to 10,000 people coming from all over the Davao Region are expected to attend the event, which is set to go on until midnight.

Davao City police said the crowd peaked at 5,000 people at 7 p.m. Saturday, although that figure may still increase

Barangay official Constancio Tiongco said they wanted to show Duterte that he continues to enjoy strong mass-based support, especially in his hometown.

There will be performances from local artists, while a number of local politicians invited to speak.

The Davao demonstration is being held simultaneously with another pro-Duterte action in Davao City.

Those behind the Cebu action are mostly volunteers during the 2016 election campaign in the province. They said the activity is their way of celebrating the 31st anniversary of the EDSA People Power Revolution.

Some of the organizers also said the activity shows they are behind the President amid supposed destabilization plots hurled against the Duterte administration.

Aside from holding a motorcade, the group also provided free T-shirt printing showing designs inspired by Duterte and Philippine National Police Chief Ronald Dela Rosa. Some supporters brought their own plain shirts and had them printed with the designs.

Also spotted during the event was Cebuano PBA star Dondon Hontiveros, who said he is throwing his support behind the President. Meanwhlie, Duterte's relatives from Danao City in Cebu also joined the activity, saying they are behind him all the way.

CNN Philippines Senior Correspondent David Santos and Stringer Dale Israel contributed to this report.