DakAL Trip Planning

[Abercrombie]

So I know I am an FNG, but I have a question about the dates and trying to coordinate this ride with an interested friend. He lives in Spearfish and usually goes by "bigjohnsd" on FJR forums and definitely sounds like he is interested in joining this group ride.

My question is, the ride is scheduled from the 10th to the 15th so does that mean I would need to arrive the 9th, the day prior and return on the 16th, the day after, or is the 10th and 15th already the arrival and departure dates with actual DakAL riding on the four days of the 11th - 14th?

I'm just starting the planning process and trying to determine whether to unload in Hill City, or in Spearfish, and ride down with John to the starting point in Hill City.

I'm sorry if I am pressing for too many details too early, being such a new guy on the block.