This is the ninth annual event, which over the years has raised more than $200,000 for the Juvenile Diabetes Research Foundation.
From 10:30 a.m. to 1 p.m., root beer floats, served by local celebrities, will be priced at $2 each with additional money going to the foundation.
They'll also be selling mugs autographed by A's players leading up to the game against the Kansas City Royals.
