Thank you for the reply.
Regarding the environment on the OnStage stage, local organisers are preparing meet with our request. We have confirmed them that the main stage will be similar to last year’s. So teams will be able to project slides/videos on the wall behind.
By the way, if there are any communication between bots and PC, teams need to follow the rule 1.4.1.
1.4.1. Teams are encouraged to design their robot(s) with a communication function. Robots are encouraged to communicate with each other on stage, for example, with a Bluetooth communication option (refer to 2.7 and 2.8). There must be no communication between off-stage and on-stage devices.
Unfortunately, it has not be clarified where the AV system will be located. Your team might be better to prepare a long HDMI cable to connect between your PC on stage and off-stage AV system.
Also about lighting on the stage, it would be well adjusted, we cannot say definitely at this moment though. We kindly ask teams to prepare to calibrate sensors as mentioned in the rule 1.5.2
1.5.2. Although the RoboCupJunior organizers endeavor to make variable lighting including spotlights available, there is no guarantee that direct or intense spotlights will be available. Teams should come prepared to calibrate their robots based on the lighting conditions at the venue. Teams using compass sensors should be aware that metal components of the staging may affect the compass sensor readings. Teams should come prepared to calibrate such sensors.