Any accommodation near Newchurch-in-Pendle will probably be the best bet. That seems to be the epicentre of the whole pendle witch touristy stuff, being one of the closest villages to Pendle Hill and the Pendle Witch history.
Not been there myself since I was a teen when we used to do bike rides to pendle for a day out, so it may have changed since then. Around halloween it used to get very busy (walking to the top of the hill, which is almost a mountain, is a popular thing for locals), so much so that the rozzers closed some of the roads to keep traffic away.
If you can't find anywhere suitable nearby, there's always The Witch Way bus from Manchester, though it's a normal service rather than tourist bus, so doesn't go that close to Pendle Hill itself. You will get some good views of the hill in the distance though, and also a 'tour' through the scummy decaying ex-industrial towns such as Burnley, Nelson, Colne.