How about the official 2019 Iron Butt Rally webpage?
That's where the IBR Daily Reports, written by IBR veteran John Harrison, will be posted.
From Lisa Landry, Rally Master and IBR Mom extraordinaire:
We love spectators and the energy they bring to event, not to mention the
support offered to riders. We ask that you park away from the designated
rider area and be sure to leave space for riders to easily access the hotel
from the parking lot, especially as we get into penalty minutes.
Thanks and hope to see you soon!
All Start and Finish activities will be at:
One Parkway East
Greenville, South Carolina 29615
CHECK IN WEEKEND
Saturday, June 15
Sunday, June 16
Monday, June 17
Motorcycle Impound 8am
Rally Start 10am
Note that riders will start arriving as soon as Wednesday, in order to finish those last few items and have some precious down time before the madness starts.
Both checkpoints will be at:
Hilton Garden Inn Tri-Cities Kennewick
701 North Young Street
Kennewick, Washington, 99336
CHECKPOINT 1 INFORMATION
Thursday, June 20, 8pm
CHECKPOINT 2 INFORMATION
Sunday, June 23, 8pm
Note that 8 PM is the start of penalty points, so riders will be arriving all day long to get an early start on scoring and necessary bike maintenance.
FINISH - Friday, June 28, 10 am
Finishers' Banquet 6:30pm - Sold Out
As Lisa has said, spectators are welcome, but do be respectful to the riders. They're on a tight schedule, and likely quite stressed out. If you are mechanically inclined and wish to offer assistance with tire changes and basic maintenance that can be appreciated, but again, be respectful to the riders.