to be held on march 1-10

[kvvic]

Dear all,

Could you please give your opinion about the use of 'on' in the following sentences:

...prizes, cameras and toys await the winners of the Boots Northern Ireland Children of the Year competition to be held on the 7-11th of September.

Don't forget to visit the Yarn Fair for London, the South and South East at the Old Loom Mill, to be held on 17–20 September.

On Jan. 25 a debate in the Assembly of Bosnia-Hercegovina ... endorsed a referendum on the republic's sovereignty to be held on Feb. 29-March 1.

They were taken from the British National Corpus (some newspapers), which means they are supposed to be correct. On the other hand, I know that 'on' is used before one specific date. Is it a mistake? Or is there some grammatical rule that allows this use of 'on'? Or some other reason?

[5jj]

You have just asked this question in another thread. Please do not risk confusion by starting another thread on the same topic.

[kvvic]

Would it be possible to take my thread to this topic, as you did last time? Because I would really appreciate it if somebody could promptly answer my question.