Around 7,000 people are expected to run the Leeds Half Marathon which has been organised for the second time by Jane Tomlinson's Run For All.
An extra thousand places were made available after the original allocation filled, and organisers are expecting it to be the biggest hospice run of its kind.
Last year's event raised around £150,000 for charities.
As well as the half-marathon, a Corporate Relay, and a Mini and Junior run for 1,500 children will also take place.
Runners in the cancelled Sheffield Half Marathon are being given a discount to enter in the Chesterfield and Derbyshire Marathon in September.
Organisers of the Chesterfield and Derbyshire Marathon will provide entry into the full marathon at £25 and the half marathon at £15 - a reduction on the current prices of £35 and £20 respectively – if they sign-up before June 1.
Any runners entering the relay race, usual price £100, will receive a £20 discount.
Runners will have to provide their Sheffield Half Marathon race ID number to qualify for the reduction.
Chesterfield and Derbyshire Marathon takes place on Sunday, September 14 and will raise funds for children’s charity Kids ‘n’ Cancer UK, as well as other local charities and causes, including Sheffield Children’s Hospital Charity.
Runners can take part in a full marathon, half marathon and a relay race, where four competitors take a share of the course. There will also be a fun run for parents, children and anyone wanting to take part in shorter distances up to two miles.
Mike Hyman, founder of Kids ‘N’ Cancer and the marathon, said: “We have great sympathy for both the runners and organisers in the cancellation of the Sheffield Half Marathon after everyone had put in a lot of hard work in the build-up to it.
“We therefore wanted to offer our support by providing a discount to those runners to provide them with a race in the region of similar distance. The offer will be open to runners wanting to take part in both the half marathon and full marathon as part of our day in September.”
More than 450 people have already signed up to take part in the Chesterfield and Derbyshire Marathon and entry is now open for all events.
The organisers have tweeted an apology: "We would like to express our sincerest apologies to everyone involved in the race who will be affected. We will update you future plans asap..."
Jade Fallowfield - a runner from Wath-upon-Dearne in South Yorkshire - is taking part in the Yorkshire Marathon today in aid of Bluebell Wood Children's Hospice, to thank them for caring for her 10 year-old cousin Elijah.
Elijah was diagnosed with an inoperable brain tumour in June 2011 and sadly lost his battle in May 2012 spending his final days being cared for at Bluebell Wood.
- The Yorkshire Marathon takes place today and this much-anticipated run through the heart of York will be the biggest marathon in the whole of the white rose county.
All places in the first ever York marathon may have sold out - but the RSPCA is offering 25 runners the chance to take part.
All 5,500 places in the event - organised by For All Events, the organisation set up by the family of charity fundraiser Jane Tomlinson - sold out in three days.
The first ever Yorkshire marathon has sold out with 5,500 places being snapped up in three days. It is being held in October in memory of charity fundraiser Jane Tomlinson.
Talks are now on going to see whether, in coming months, capacity can be increased a final time to 6,000, which would make a further 500 places available.
Nearly all places for York’s first marathon have been filled in just two days.
The event, on October 20, is organised by a new company under the Jane Tomlinson’s For All Events umbrella. Entries have come from across the UK, France, the Netherlands, Australia, Canada, the USA and even the Bahamas.
Runners can raise funds for any cause of their choice or one of the event’s partner charities.
More than 3500 thousand runners have already signed up for the first Yorkshire Marathon just 36 hours after it was launched.
Organiser Mike Tomlinson says he's never known one of the Jane Tomlinson For All events take off in this way and that the sign-up has already exceeded expectations. Runners from Australia, New Zealand and the Caribbean have already bagged a place.
It takes place in York in October and is the biggest event in memory of Mike's wife Jane since she lost her battle with cancer in 2007.
Jon Mitchell has the forecast for Wednesday 9th January
Since Jane Tomlinson passed away in 2007, her family has carried on that tremendous fund-raising tradition, and today her husband Mike announced the first ever Yorkshire Marathon.
A host of stars lined up in York to launch the event, which will be organised by the Jane Tomlinson charity, "For All Events". Adam Fowler reports.