(USA TODAY) -- The 118th Boston Marathon will be a mixture of triumphs and tears, beginning with a tribute event Tuesday honoring those injured in last year's bombings. A look at the week heading into the April 21 race:
The field: There will be 36,000 entrants, a 33% increase from limits of 27,000 runners in recent years. It will be the second-largest field size in Boston history, behind only the centennial Boston Marathon in 1996 that had a starting field of 38,708.
The field includes about 4,500 of 5,624 athletes who were still on the course last year when the two bombs exploded.
The elite runners include defending men's champ Lelisa Desisa (Ethiopia) and top contenders Dennis Kimetto (Kenya), Gebre Gebremariam (Ethiopia) and Micah Kogo (Kenya), plus Americans Ryan Hall and Meb Keflezighi.
On the women's side, reigning champion Rita Jeptoo (Kenya) and past champions Sharon Cherop (Kenya) and Caroline Kilel (Kenya) will compete. The field also includes American Shalane Flanagan, who placed fourth last year in her first Boston Marathon. Defending wheelchair champion Tatyana McFadden also will compete.
Tribute event: On Tuesday, exactly one year after the bombs exploded on Boylston Street, hundreds of survivors, first responders and other officials, including Vice President Biden, will honor those affected by the events that killed three and injured more than 260.
The event will take place at the Hynes Convention Center. A flag-raising ceremony and moment of silence will take place between 2:30 and 3:00 p.m. ET at the finish line. At 2:49, when the first bomb went off, churches throughout Boston will toll their bells.
Security: The number of police officers will be doubled to more than 3,500 for the race. More than 100 cameras have been installed along the Boston portion of the route and 50 observation points will be set up around the finish-line area to monitor the crowd.
Spectators are strongly discouraged from bringing backpacks and other large items and are being asked to carry personal items in clear plastic bags. Unregistered runners, known as bandits, who jump into the race along the route will be prohibited.
Boston Police Commissioner William Evans and other city officials detailed security Saturday. "I'm confident in our plan," he said. "Unfortunately, since 4/15, things have changed and, as a result, security for the race will be enhanced and stepped up as well. That said, we're not looking to scare people. ...But believe me, we're going to have plenty of assets and, if need be, they'll be rolling in very quickly. But the goal is to make it a safe family day."
Where to watch: Universal Sports Network will stream Tuesday's tribute event live and air a one-hour program that night. The network will also re-air the 2013 race for the first time. Given the wide interest in this year's race, Universal Sports will be made available to all U.S. TV distributors for a free preview today through race day. For the first time, there will be a finish-line webcam that will record and archive every runner who finishes, from the winner to the final racer, on UniversalSports.com.
Booked up: Good luck finding a hotel room if you want to watch in person. Average price per night for the weekend is $397, according to Hotels.com. Searches on the website for Boston hotels during marathon weekend have increased by 77% over the past year compared to the same time period leading up to the 2013 race.