Trust is a single list
If your day-of lead is reconciling email replies, texts, and a spreadsheet, you do not have a roster — you have hope. Executive Directors get blamed when doors open late; the fix is operational, not inspirational.
SignUpGo as the intake
Collect shifts in one place. Cap roles that are truly limited. Export once the morning of. Mark no-shows for the postmortem. That is enough system for most community events.
Pair with ticketing
If the same night sells reserved seats, keep volunteer shifts in SignUpGo and seats in EventTicketGo (or your box office). Mixing both into one consumer tool usually means neither job is done well.
Sign-ups without parent accounts, ads, or another login to forget.