Singer Pat Monahan will be signing "Save Me, San Francisco" Ghirardelli chocolate bars -- a new line of chocolate bars named after his band's chart-topping album and single.
The event is scheduled for 3 p.m. at the chocolatier's main store.
The bars, which feature images of local landmarks such as Coit Tower and Fisherman's Wharf, are part of Train's philanthropy efforts, with 100 percent of the proceeds from the bars' first production going to the Family House charity.
Family House provides housing to families with seriously ill children.
The special chocolate bars are available in flavors including dark cabernet, sea salt almond and 72 percent cacao dark chocolate.
A music video for the single "Save Me, San Francisco" released in April 2011 featured band members singing and performing throughout the Bay Area.