It is incorrect to use <related> here. Not because this link not related but for another reason - this link will be missing
"The IV engine automatically checks whether articles in the <related> block have an IV, you don't need to worry about this. If pages have no IV, they will not be displayed. If this results in an empty block, it will not be displayed." https://instantview.telegram.org/checklist#6-3-2-related-articles
As you can check, templates don't generate page https://realnoevremya.ru/events/1141 because of unsupported widget in it. That means that full selected <related> block will be deleted in actual IV
But this link is pretty essential and template must not lose it
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"The IV engine automatically checks whether articles in the <related> block have an IV, you don't need to worry about this. If pages have no IV, they will not be displayed. If this results in an empty block, it will not be displayed."
https://instantview.telegram.org/checklist#6-3-2-related-articles
As you can check, templates don't generate page https://realnoevremya.ru/events/1141 because of unsupported widget in it.
That means that full selected <related> block will be deleted in actual IV
But this link is pretty essential and template must not lose it