What is a “LID”?
Acronym finder says “Living in Denial.”
“Low Intensity Day’’.?
I believe it is a political term which means they are putting a "lid" on the campaign for the day. IOWs, no campaign activity for that day.
That they have been putting a "lid" on Biden's campaign appearances for so many days in a row is telling. He simply cannot do campaign appearances without making some huge gaffe, so his campaign aides keep him under wraps and cancel any political activity that might have been scheduled that day.