What are some tips for filming a large group show

The more group actors you have, the more people you need to control them. On many shoots, the on-set management of the group conductor, extras and crew is handled by the assistant director (or assistant director). The assistant director needs to deal with managing all the working groups on set, keeping them on schedule, and resolving any unexpected issues - this allows the director, and those involved, to focus more on the shoot.

Producing Assistant Crew/Group Conductor

The Assistant Director's Crew usually leads the Producing Assistant Crew. You'll need Production Assistants and Crew Chiefs to coordinate the crowd to keep them in line and to control and direct the crew. This includes preparing their costumes and make-up, and guiding them into formation as directed by the director - not to mention feeding and watering them, as well as any medical or physical issues that may arise with the actors.

Walkie Talkies/Headsets

On larger, more complex shoots, the most important tool is a walkie-talkie system with a solid signal. Dealing with a large crowd of actors is nearly impossible if you can't immediately communicate with the assistant director's crew and the assistant producer's crew. Be sure to have backup communication equipment, batteries and backup charging to ensure you don't lose contact.

Loudspeaker/megaphone

In the case of a large-scale group shoot, a tweeter and megaphone system is the only option to allow your team to direct the dispatch since large crowds tend to be noisy, scattered, and difficult to communicate with and direct. It's helpful when the crowd needs to react to cues or perform synchronized movements. Getting them all together for a brief "instant reaction" with a tweeter is your only option.