The event is a fundraiser for SignHealth through a suggested £1 donation from everyone taking part on 6 February 2013.
The charity, which provides advocacy, counselling and mental health services for deaf adults and children all over the country, is hoping 175,000 youngsters will participate in its sign2sing event.
Altogether now
Rowena Dean, head of marketing and communications at SignHealth, said: "sign2sing is our world record breaking attempt for the most people singing and signing a song simultaneously.
"Seven-hundred and fifty-six hearing and deaf schools have signed up so far and we're hoping more than 1,000 will take part, so we're on a mission to register more schools in the next few months.
"We will also be giving the 1,000th school to register Sign with Olli classroom resources, as well as hosting monthly prize draws in the run up to the event for registered schools to win Sign with Olli books.
They've got previous
Earlier this year 114,277 young people took part in sign2sing 2012 and smashed the Guinness World Record. The previous record, which SignHealth also set, was 94,489.
This will be the charity's third sign2sing event. Schools, colleges and nurseries across the country can all host their own sign2sing event.
This year, teachers and pupils who sign up will have access to digital resources developed by SignHealth in partnership with Digital Giving.
Although the game is entertainment-led, players will be steered to access important communication messages, tips and information as part of the experience.
Dean added: "The digital resource pack is available to all schools that register for sign2sing and includes a free whiteboard app.
"Sign2sing is all about communication and the app will make it easy for teachers to teach the signs and song in an engaging way."
Schools wishing to take part are invited to register their interest via
sign2sing.
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