Metropolitan Police Division 1 has provided support for Nang Loeng police station by deploying 450 policemen at the venue and preparing another 150 as a back-up.
Pol Maj Gen Wicharnwat Borirakkul, commander of Metropolitan Police Division 1, said local police would be deployed inside the race track while those mobilised by the division would maintain order around the venue.
Security checkpoints on roads adjacent to the Royal Turf Club have been set up since late last night to prevent activity by "third hand" elements, he said.
Police will move to their positions at about 7am, three hours before the rally takes place.
Pol Maj Gen Wicharnwat has estimated about 2,000 people will join the rally, while the organisers, led by retired Gen Boonlert Kaewprasit, expect a crowd of more than 10,000.
The Pitak Siam movement has enlisted support from a number of groups including the Dhamma Army which is closely linked with Maj Gen Chamlong Srimuang, a yellow shirt leader.
Among the speakers are supporters of the yellow shirt People's Alliance for Democracy including Surapong Chainam, a former Thai ambassador; Gen Pathompong Kesornsuk, former chief adviser to the Supreme Command; Seri Wongmontha, a prominent political critic; and Sqn Ldr Prasong Soonsiri, former secretary-general of the National Security Council.
Deputy Prime Minister Chalerm Yubamrung doubted that the rally would draw enough people to overthrow the Yingluck administration.
He said the organisers were shunned by people in the Northeast.
"They love former prime minister Thaksin [Shinawatra] and they themselves voted for Ms Yingluck as the prime minister," he said.
Mr Chalerm also urged those who were plotting a rally to unseat the government to think twice.
"No matter how many times you try to shoo us away, we always come back. It would be better to call off the campaign so it won't hurt business and tourism," he said.
Defence Minister Sukumpol Suwanatat said yesterday no soldiers would be needed at the rally. He was confident the police could handle the situation.
He also called on the media to tone down its reporting of the rally so that there would be no problems and people would disperse peacefully.
Sunisa Lertpakhawat, deputy spokesperson for the Pheu Thai Party, asked the rally organisers to respect the rights of those who will not be joining the rally.
Ms Sunisa cited a Suan Dusit Poll of 1,318 people carried out from Oct 23-26 in which about 44.4% of respondents said Pitak Siam lacked sufficient reason to hold an anti-government rally at this time.
Most of those who disapproved saw the rally as a political move to pressure the government and called for negotiation as a tool to resolve conflicts.
About 45.8% of the respondents also said they believed the rally would not bring the government to its knees.
Meanwhile, Pheu Thai yesterday rejected the Democrat Party's claim that Prime Minister Yingluck Shinawatra was trying to avoid a planned censure debate.
Ms Yingluck is scheduled to make a number of overseas trips in November. The prospective date for the no-confidence debate is Nov 26-27.