At 10:15 GMT on Friday, an order of service will be tweeted by organisers, with links to hymns and a two-minute silence - when tweeting will stop.
British service personnel in Afghanistan held a two-minute silence at 11:00 local time (06:30 GMT).
Hymns were sung and a two-minute silence was held, before wreaths were laid at the scene at Narrowwater.
Thousands of people gathered at the town's Polo Ground for a two-minute silence.
Exhausted rescue teams laid down their tools as a two-minute silence was observed.
The flag at Hampshire police HQ in Winchester is flying at half mast and officers will be holding a one-minute silence at 11:00 BST.
On Tuesday, a two-minute silence will be held at the memorial at 18:37 BST as part of a service to mark the anniversary of the attack.
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Members of the public gathered at the Garden of Remembrance adjacent to the Scott Monument for a two-minute silence, marked by a gun from Edinburgh Castle.
It also invites the UNESCO General Conference to propose that a one-minute silence be observed in newsrooms worldwide on World Press Freedom Day (3 May) to honour the journalists killed each year.
The crowd observed a moving minute's silence for the 20-year-old, who died during a reserve match on Sunday.
Thomson also said that the SFL had requested that all clubs observe either a minute's silence or applause before kick-off.
It doesn't seem much to ask that other journalists -- and why not also political leaders and willing members of the public -- should stop for a minute's silence on one day each year, May the third, to pay tribute and reflect on the courage of those who have died for our right to know.
Fans paid tribute at Sunday's Swansea-Aston Villa game when a minute's silence turned into applause.
Sport is an example: professional football was called off on the day of her death but stiff-upper-lip cricket went ahead after a minute's silence.
Flags were lowered to half-mast across Italy and the Italian Senate observed a minute of silence.
City beat their rivals 2-1 after both clubs' fans impeccably observed a minute's silence to mark the 50th anniversary of the Munich air disaster.
There was a minute's silence before the game for former Wigan and Great Britain forward Terry Newton - not as respectfully observed as it might have been by a near capacity crowd.
United manager Sir Alex Ferguson and counterpart Sven-Goran Eriksson each laid a wreath either side of the centre circle before an impeccably observed minute's silence.
The Royal British Legion - which is celebrating its 90th anniversary this year - held a "Silence in the Square" event in Trafalgar Square, featuring musical performances and readings before the two-minute silence.
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