That sounds like a wonderful idea! I've had a look, and I couldn't find a specific tour that includes events in Derry-Londonderry or Dublin, but I have found some options which I think might be of interest. Destination Ireland
organises a tour around Ireland's most famous Haunted Castles
. You can either drive yourself, or be chauffeured from castle to castle. Adams and Butler
has a haunted houses tour available, so feel free to get in touch with them for the options as well. Authentic Ireland
's 8 day Haunted Ireland Castle tour
comes closest to what you're looking for. On the itinerary you will find several haunted castle visits, including spending the night in one. The tour starts in Dublin and can be booked throughout Halloween, so you could combine it with events in the city.
Are you planning on visiting during this upcoming Halloween or next year? If there is anything else you need, please don't hesitate to reach out. We're always here to help!