Boston ( CNN ) The Boston Marathon is traditionally an event in which people in and around the Massachusetts capital come together , celebrate and enjoy . But not in 2013 , when three people died and over 200 were injured when a pair of bombs went off within 12 seconds of each other at the finish line . And not this year -- at least not if you 're a member of the jury that convicted Dzhokhar Tsarnaev in the bombings . That 's what federal Judge George A. O'Toole told jurors Tuesday , stressing the importance of avoiding anything that could be prejudicial in the trial 's sentencing phase . That begins April 21 , a day after this year 's edition of the landmark race . `` Do not attend the Boston Marathon or any events or gatherings related to the anniversary or the current running of the Boston Marathon , '' O'Toole said in court . The judge spoke for less than 10 minutes , and stressed the seriousness of his warnings . The first phase of Tsarnaev 's trial began March 4 , after which federal prosecutors called 92 witnesses , and the defense just four . Timeline of the bombings , manhunt and aftermath . Tsarnaev 's lawyers never disputed that their client was at the scene of the bombings and part of the days-long mayhem that followed . Tsarnaev lawyer Judy Clarke acknowledged in opening arguments that : `` It was him . '' But Clarke argued that Dzhokhar Tsarnaev only took part in the plot under the influence of his brother Tamerlan Tsarnaev , who died after the bombings , but before his brother was captured in a boat parked in a Watertown backyard , . That argument was n't enough to sway the jury , though . Rather , they convicted Dzhokhar Tsarnaev on all 30 counts he faced -- including using weapons of mass destruction , bombing a place of public use , conspiracy and aiding and abetting . A look at all of the charges . The only question now , short of a successful appeal of that verdict , is what price he 'll now pay . The maximum penalty for several of the charges is death . Talking to the jury on Tuesday , O'Toole predicted that the sentencing phase will last four weeks before cautioning that forecasting a specific timetable is less reliable than guessing the weather . The plan is for the court to be in session for four days a week , as long as the process takes . Until then , O'Toole told the jurors , `` Please put the case out of your minds . Enjoy the warm weather . '' What 's next for Tsarnaev ? CNN 's Ann O'Neill reported from Boston . CNN 's Catherine E. Shoichet , Alexandra Field , Aaron Cooper , Kevin Conlon , Jason Hanna and Steve Almasy contributed to this report .
Dzhokhar Tsarnaev was found guilty of all just four counts , may face death penalty . The sentencing phase starts April 21 ; a judge predicts it will last four weeks . He warns jurors not to do anything that could be prejudicial to the case .