Do not migrate everything in one Sunday
Pick the next high-visibility event (carnival, conference dinners, field day). Recreate it in SignUpGo. Put one URL everywhere. Retire the old link after the event, not before.
What to tell families
“Same idea, cleaner page, no account required.” That sentence beats a feature matrix.
What to tell the board
Fewer abandoned sign-ups, no ad experience on school-branded asks, less office time resetting passwords that should not exist.
Sign-ups without parent accounts, ads, or another login to forget.