Having a map for ALL (not just one) of a Selected Day’s games with multiple filters (or layers) including: Active Venues/Locations, Assigned On-floor/On-field officials, Assigned supervisors/timers/other, unassigned officials, unavailable officials, each with it’s own coloured/type of icon.

Most importantly, and the reason for this entire suggestion: For Selected Daily Locations with active games, a MAP overlay showing the map travel/ROUTE (coloured lines) for the Assigned officials to each venue would be invaluable (a bunch of unassociated dots on a map are of little value) — as an assignor, this would provide a quick visual to allow for shuffling officials in order to reduce mileage (carpooling, switching assignments, last-minute turnbacks). Especially considering how widespread the geography is for some sports 100-200 km (60-120 miles) is not an unusual daily mileage cost for some clubs (in Ontario we pull officials from an area twice the size of Texas). Mileage fees are often more costly than the game fees.
And with over 800 officials, 10 zones, and 2-5 assignors per zone, minimizing those costs is what would make a visual (map) that identifies travel inefficiencies very helpful when assigning.

[At the moment, I have my own google map set up with the 30+ officials I typically assign to three venues - no mileage under 20 km, but it helps set up carpooling and minimize travel times (rush hour is all day in the city - 10 km/5 miles takes 30-45 min all day).]