What aperture should I use to shoot the venue?

The meeting was divided into panoramic views and close-ups of leaders.

And according to the scale of the meeting, sometimes photographers are not allowed to take pictures in front of the leaders, so you should use the lens differently.

As for the aperture

Try to ensure the depth of field when panoramic, and it will be better to narrow the aperture, such as 8.

If there is no special requirement for the close-up of leaders, don't use large aperture and shallow depth of field, because it will blur the background, make it difficult to distinguish which meeting it is, and there is no environmental factor. But the depth of the scene doesn't matter much.

The most important thing is the appropriate shutter speed to ensure the clarity of the characters.