Simplify the following text for a Grade 9 native English-speaking person.
Original: WrestleMania 's annual fan convention , WrestleMania Axxess , was held from March 25 through March 28 at the Phoenix Convention Center .
Simplified: WrestleMania 's yearly fan convention , WrestleMania Axxess , was held from March 25 through to March 27 .