Need to split video signal to both HDMI and VGA

I am hosting an event and the venue has given me a really tough challenge. I need to send a video signal from my Macbook Pro 15"(the highest spec, latest model) to a projector that only accepts VGA and to an A/V system that only accepts HDMI(this A/V system broadcasts the signal to several flatscreen TVs throughout the venue). Here are my two ideas, can anyone tell me if this will fail and if so, are there any other solutions?
Idea 1: Use a mini-display to VGA adapter, split the VGA cable with one VGA cable going to the projector, and the other VGA cable going through a VGA to HDMI adapter to the A/V system
Idea 2: Use a mini-display to HDMI adapter, split the HDMI cable with one HDMI cable going to the A/V system and the other going through an HDMI to VGA adapter to the projector
Idea 3: Rent another projector that accepts HDMI, use a mini-display to HDMI adapter and split the HDMI cable, with one going to the projector and the other to the A/V system(this is the most expensive option and I want to avoid this if possible)
The event is tomorrow evening, and I need to buy these cables today if possible. Would love to hear any ideas, thanks!!!

Yes. All video and audio outputs are always active.

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Need to split video signal to both HDMI and VGA

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