During about the early 1900s, Chula Vista was known as the lemon capital of the world. A mostly agricultural town, these suburban streets used to be covered with lemon groves.
The stages, of course, hosted several lemon-themed delights: a lemon pie eating contest, a lemon peel contest (where people could see how fast they could peel the rind off a lemon), and the largest lemon contest.
Local Chula Vistans, Peter Watry, has written the most comprehensive book about Chula Vista lemons called The Lemon Industry of Chula Vista 1890-1960. You can read excerpts at the South Bay Historical Society website.