I cannot believe that none of the official sites have spectator rules.  God knows the individual venues are not equipped to write their own.

No wonder we are not a more popular sport - no advertising and no way to make the stray non-participant feel comfortable.

Dressage

Turn your phone off or to vibrate

No talking while ride is going on

Quiet talking between rides is permitted

Sit in the grandstands if available

Sit or stand back from the rail if grandstands are not available

Do NOT crowd the in gate

Try not to ride the test with your rider.  You do not want to share the humiliation

Quiet applause is appropriate at the end of each ride

Cross country

Turn your phone off or to vibrate

Do not point directions to anyone. It can be considered giving aid

Stand in the open

Do not stand in the trail. Riders will run you down, and no one will tell on them

Stand quietly wherever you are

If you see a horse coming and other spectators do not, shout “Heads up” or “Horse coming” ONLY loud enough for them to hear

Stay alert and know where the horses are at all times

If you are near a jump, stand behind the jump judge until a horse is past

Walk wherever you are going on course

All officials wear badges. The appropriate answer to any order they give you is “Yes, sir or ma'am.” Do what they say quietly and quickly. If they don't kill you for disobedience, I will

Stadium

Turn your phone off or to vibrate

No talking while ride is going on

Quiet talking between rides is permitted

Sit in the grandstands if available

Sit or stand back from the rail if grandstands are not available

Do NOT crowd the in gate

Try not to ride the course with your rider.  You don't want to share the humiliation

Applause is appropriate at the end of each ride