Expo Overview:
https://guide.rundisney.events/expo/
A= Advent Health Arena
B= VISA Athletic Center
C= HP Field House
I see two main scenarios:
I want runDisney merchandise
My recommendation is to go to A (Advent Health Arena) first. If you go on the first day (Thursday, Feb 24th) around opening (10am), then expect to wait in line to get inside. The earlier you arrive, the more likely you will be to get a specific item or size. Items do tend to sell out within hours of the Expo opening, and it is impossible to predict. However, given shipping shortages worldwide, and Spring Surprise was given no pre-sale opportunities, I believe merch will be more limited than a normal runDisney event. The expo buses begin running around 9:30am from resorts.
After shopping in A (Advent Health Arena), head to C (HP Field House) to pick up you bib. If you need to sign a paper waiver, or talk with runner's relations, then this is also in the HP Field House.
After picking up your bib in C (HP Field House), head to B (VISA Athletic Center) to pick up your free event shirt. At the VISA Athletic Center is where you'll also find other non-runDisney vendors.
I don't want runDisney merchandise
Skip going to A (Advent Health Arena) completely and, head to C (HP Field House) to pick up you bib. If you need to sign a paper waiver, or talk with runner's relations, then this is also in the HP Field House.
After picking up your bib in C (HP Field House), head to B (VISA Athletic Center) to pick up your free event shirt. At the VISA Athletic Center is where you'll also find other non-runDisney vendors.
If you're a visual person, this is a
youtube video from MW 2022 that shows a good run-down of the Expo experience upon arriving at WWOS.