As disgraceful as this is three of the four weeks Parliament would be suspended are Conference season anyway, so even with Halloween coming presumably Parliament wouldn't have been in session anyway.
However, the Conference break is done at the discretion of the HoC. They can, technically, vote to not suspend parliament, and simply move parliament to another building nearby that weeks conference if Bercow brings the mace with him.
That latter bit is important. Even if the Queen does prorogue, parliament can still sit, just not in the HoC. It will be unofficial, and the government can ignore it if they wish, but Bercow can move the mace to another building, and as long as 40 MPs turn up, it is technically a parliament.
(pre-apologies Asa/Charlie if this post is off topic or is too political for the forum)