A warrant has been issued for the arrest of a 27-year-old concert promoter and festival founder alleged to have stolen the proceeds of a two-day music festival held at Ottawa Stadium over Canada Day weekend.

Police are asking for the public's help to find Nickolas Guindon-Vachon of Ottawa, who founded the Escapade Music Festival.

The warrant was issued days after police were called to the stadium on Tuesday, where other festival organizers said $600,000 was missing.

Nickolas Guindon-Vachon has not been seen or heard from since Monday morning. (Facebook)

Guindon-Vachon is wanted for theft over $5,000 and possession of stolen property over $5,000.

Det. Stephen McDougall told CBC News someone associated with the festival watched Guindon-Vachon get into a rented white GMC Yukon on Tuesday at about 5:15 a.m., carrying a large box.

The vehicle was later discovered in a parking lot at Montreal's Pierre Elliott Trudeau Airport. Montreal police searched the vehicle, but did not find Guindon-Vachon.

McDougall would not say whether police know if Guindon-Vachon has left the country.

He is described as white, 285 pounds, standing five feet, eight inches tall with brown hair and brown eyes.

Anyone with information on Guindon-Vachon's whereabouts is asked to call Ottawa police at 613-236-1222, ext. 5166, or Crime Stoppers at 613-233-8477 (TIPS) — toll free at 1-800-222-8477.