Professor Dumbledore,
I promised to write as soon as I had news. Yesterday I met with a large faction - well, more accurately, perhaps, at least two factions and fragments of three others - of Slytherin families. We are ready to move, although perhaps need a fortnight or so to assemble everyone and move in unison. We were hoping to withdraw all the Slytherin children we can on the weekend of the 19th and 20th of September. It would not do to wait longer, even if our numbers could be increased, as the impact would be lost. Also, I do not think it good for Severus that we delay any more than is necessary.
In fact, our move will already involve a small number of Ravenclaw students and one Gryffindor student, who are siblings or cousins of Slytherin children and whose families naturally want to keep them together. So I am writing to hope that Gryffindor too might be ready to move at this time.
I will naturally assist in any way that I can. If there is any way that I can.
Sincerely,
Draco