Some of those appearing in court Monday are charged with setting fire to Toronto police cruisers. (Canadian Press)

The stage is set for a crush of people to descend on a northwest Toronto courthouse Monday as more than 300 people charged with offences related to the G20 summit are set to appear for a marathon session — along with their families, supporters and lawyers.

As 303 people have appeared in court to face various charges over the past three months, they have all had their return dates set for Monday at the courthouse. It will be one of the largest mass court appearances the city has ever seen, according to Toronto police G20 investigator Det. Sgt. Gary Giroux.

"If you're out [of custody] you'll be appearing. If you're in, you're appearing physically, in custody or by video," he said.

Giroux said the cases will be spread over three courtrooms, but people close to the case say it is unclear whether the cases will be processed in an assembly-line fashion, or how long they might take.

All agree it will take hours to get through all of them.

Other than a few people who are in custody and scheduled to appear by video at 11:30 a.m., most people have 9 a.m. scheduled appearances at the Ontario Court of Justice at 2201 Finch Ave. W.

Court staff are prepared for the hundreds of people expected to descend on the courthouse, but the sheer number set to appear presents some challenges, said Brendan Crawley, spokesman for the Ministry of the Attorney General.

"Arrangements have been made to make the process as efficient as possible for the accused, while maximizing access for the public and the media," he said in an email.

"We hope to maintain a smooth flow of people into and out of the courthouse, but given the number of accused scheduled to appear, it may take some time to deal with these matters."

Vandals damaged businesses in downtown Toronto during the June 26-27 summit. (Canadian Press)

Those appearing Monday are charged with a variety of offences related to the June 26-27 downtown summit of G20 leaders, where several people dressed in black broke off from a peaceful protest and smashed store windows and torched at least five police cars.

Most of the people appearing Monday were arrested at a protest at the Ontario legislature on June 26, Giroux said.

A group of alleged ringleaders charged with conspiracy to assault and obstruct police will also appear.

Police say the group also includes about 20 people arrested after police released photos of their "most wanted" suspects.

The Canadian Press contacted several lawyers representing the accused, but many said they would not comment on active cases.

Lawyer Adam Weisberg, who represents a client charged with conspiracy said the expected delays could affect the defendants' rights to speedy trials.

"That's the main concern that I have with so many people charged," he said.

Many of those scheduled to appear in court on Monday were arrested at the Ontario legislature. (Canadian Press)

Weisberg said he will not bring this up with a judge until the Crown decides how each person will be prosecuted, or if they will be prosecuted at all.

One lawyer who represented a G20 accused at bail court said some of the defendants will show up in court Monday without lawyers.

"The feeling I'm getting is a lot of people are going to show up unrepresented because, I guess, there's this belief out there that the Crown's going to be dropping charges," said the lawyer, who did not want to be named because he no longer represents that client.

He said others may not show up at all, which could lead to arrest warrants.

Giroux said he expects several of the defendants to ask for French-speaking judges and Crown prosecutors because they are from the Montreal-area.

While lawyers prepare for their time in the courtroom, a group called G20 Mobilize is preparing to support the accused people outside court.

It has put out an internet appeal on behalf of out-of-towners who require a place to stay in Toronto, as well as transportation to and from the courthouse on Toronto's outskirts. The online plea also includes a request for food to be donated for those expected to be waiting for hours at the courthouse.

The group is holding fundraising barbecues and dances in Toronto, Saskatoon and San Francisco to raise money for legal costs.