Premier League riders Bjarne Pedersen and Lee Richardson are the latest star names to sign up for Magnus Karlsson's testimonial at Leicester on 17 March.
Pedersen, who will double up with Karlsson at Birmingham this year, and Lakeside skipper Lee Richardson will both make their Beaumont Park debuts.
Danish rider Pedersen said: "I have never ridden at Leicester and it's always good to come to a new track.
"Even after riding for more than 20 years I still get excited about that."
Pedsersen added: "Speedway's one big family these days and although I have never actually ridden in the same team as Magnus, of course I meet him all the time."