That is what I learned from grammar books.
"I go to the cinema tomorrow" means I am scheduled to go there at that fixed time
“I am going to the movies tomorrow” means I bought the ticket (ie I arranged it)
“I am going to go to the movies tomorrow” means I am planning to go to the movies but I have not bought any ticket.
“I will go to the movies tomorrow” means right now I suddenly have that intention of going to the movies (this is a spontaneous decision at the time of speaking)
Today is the 1st of May and the city council announced the city will be locked down from the 2nd of May to the 16th of May.
Is it correct to say
“The city will have been being locked down for 15 days from tomorrow.” (is it like a prediction?)
“The city will have been in lockdown for 15 days from tomorrow.” (is it like a prediction?)
“The city is in lockdown for 15 days from tomorrow." (is this like a future scheduled event?)
“The city is being locked down for 15 days from tomorrow.” (is this like a future arrangement?)