Young students explore the SF Bay Area Postcard Club table at SF History Days - Education Day, at the Old Mint.

Young students explore the SF Bay Area Postcard Club table at SF History Days - Education Day, at the Old Mint.

California Historical Society employees and supporters enjoy conversation and live entertainment at the opening of “Boomtowns: How Photography Shaped Los Angeles and San Francisco.”

California Historical Society employees and supporters enjoy conversation and live entertainment at the opening of “Boomtowns: How Photography Shaped Los Angeles and San Francisco.”

Trooper William Terrell of the 10th Calvary, Company G of NorCal tells students about the Buffalo Soldiers and the mission of their living history group.

Trooper William Terrell of the 10th Calvary, Company G of NorCal tells students about the Buffalo Soldiers and the mission of their living history group.

Art and history lovers attend the opening of “Boomtowns: How Photography Shaped Los Angles and San Francisco,” at the California Historical Society Gallery.

Art and history lovers attend the opening of “Boomtowns: How Photography Shaped Los Angles and San Francisco,” at the California Historical Society Gallery.

Students find out about the Chinese Historical Society at SF History Days - Education Day.

Students find out about the Chinese Historical Society at SF History Days - Education Day.

The Emperor Norton of Time Machine Tours graces us with his presence at SF History Days.

The Emperor Norton of Time Machine Tours graces us with his presence at SF History Days.

Historian Anthea M. Hartig greets patrons at the opening of “Boomtowns: How Photography Shaped Los Angeles and San Francisco.”

Historian Anthea M. Hartig greets patrons at the opening of “Boomtowns: How Photography Shaped Los Angeles and San Francisco.”

Event organizers enjoy a meal with study participants at the Stanford University Project Baseline Anniversary Event.

Event organizers enjoy a meal with study participants at the Stanford University Project Baseline Anniversary Event.

Gallery attendees at the California History Society opening of “Boomtowns: How Photography Shaped Los Angeles and San Francisco.”

Gallery attendees at the California History Society opening of “Boomtowns: How Photography Shaped Los Angeles and San Francisco.”

A participant in Stanford University’s Project Baseline Study shows off her investigational study watch, designed to monitor her sleep and activity.

A participant in Stanford University’s Project Baseline Study shows off her investigational study watch, designed to monitor her sleep and activity.

Live entertainment at the California Historical Society Gallery opening.

Live entertainment at the California Historical Society Gallery opening.

Volunteers mug for the camera at the Stanford University Project Baseline Anniversary Event.

Volunteers mug for the camera at the Stanford University Project Baseline Anniversary Event.