Cirillo, who was killed Wednesday morning while serving as an honorary guard at the National War Memorial, was a reservist serving with the Argyll and Sutherland Highlanders of Canada regiment.
Outside city hall, the Canadian flag is at half-mast. Inside, citizens are invited to sign an official book of condolences.
Hamilton Mayor Bob Bratina said Wednesday, in a press release that the city would respect the wishes of the family in determining how best to honour Cirillo.
The city also confirmed Geordie Elms, a former commanding officer of the Argyll and Sutherland Highlanders, will serve as a liaison between the media and Cirillo's family.
The book of condolences will be available at Hamilton city hall Thursday morning, and will remain there through next week. It will be located on the first floor of the building at 71 Main St. W. in Hamilton.
The Muslim Council of Greater Hamilton, meanwhile, invited the public to any of the city's mosques on Friday, where a special sermon will be read in Cirillo's honour at 1:30 p.m. ET.
Representatives of council plan to place a wreath in honour of Cirillo at the Lieutenant-Colonel John Weir Foote Armoury at 2:30 p.m. Thursday. They will follow that with a short statement and prayer.
Cirillo was also honoured online. One Facebook group set up to post stories of his life had over 104,000 likes and scores of comments remembering Cirillo as a soldier, friend and animal lover.
Tweet to @CBCHamilton or use the #RIPNathanCirillo and your Tweet may be included on this page. You can also leave condolences by using the comment section of the page below.