The NIST Boulder facility houses five major laboratories, each of which are are made up of multiple Divisions. This tour is for the Physical Measurement Laboratory (PLM). PLM has 11 divisions. The Divisions are further broken down into groups. We will have time to visit four groups. Two are in the the Time and Frequency Division. They are the - Time and Frequency Division: Neutral Atom Optical Clocks Group (which my include the atomic clock), and - Time and Frequency Division: Quantum & Nonlinear Nanophotonics Group The plan is to visit two additional groups, but NIST PLM has not yet settled on which those will be. NIST is a U.S. government agency and requires that all visitors are screened in advance. Due to the added complexity of screening foreign nationals, this tour will be limited to U. S. citizens. In addition, because some of the labs we plan to visit are not large, the size of our group will be limited to 25 members. I need to provide NIST with a list of attendees one week prior to the event for screening purposes. That is why registration ends on January 5th. Please note we need each guest’s first and last name as it appears on their I.D. NIST has provided the following logistical information: Directions starting on Hwy 36: Merge onto U.S. Hwy. 36 West to Boulder. Stay on US-36 into Boulder and take the Baseline Rd. exit. Stay left on the exit ramp and turn left (west) on Baseline Rd. Travel under the US-36 overpass, to the first stop light, at 27th Way. Get in the left turn lane and follow 27th Way up the hill to Broadway. Turn left at the stop light at Broadway for approximately 2 blocks to the next light. Turn right onto the Dept. of Commerce site. If the attendees are all driving their own vehicles I recommend arriving at 9:30; for 25 people it can take more time to get folks through security. If the group can carpool, that’s easier and shortens the time they will need to check in through security. At the Visitor Center at 325 Broadway, attendees will need to go through security and present photo I.D. I.D. requirements are available here: https://www.nist.gov/about-nist/visit/campus-access-and-security Bldg: Visitor Center, 325 Broadway, Boulder, Colorado, United States, 80305