The former Manchester United and Wales star will be at the Woodside Leisure Centre in Horseshoe Lane on July 4, with tickets now on sale.
A rarity in football, Giggs was a "one-club man", making 672 appearances for Manchester United during a 24-year career, before a brief spell as interim manager in 2014.
He won 13 Premier League titles and two Champions League trophies, making him one of the game's most decorated players.
In Watford, fans will be able to hear the 51-year-old share stories from his illustrious career, as well as take part in an audience question and answer session.
Ryan Giggs.Ryan Giggs.
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An auction of signed memorabilia will also be held during the intermission.
Tickets start at £32, rising for packages that include a photo with Giggs and a table with drink service.
Since retirement, Giggs has become part-owner of League Two side Salford City and managed the Welsh national team until 2020.