How many watts for how many people? Portable PA system?

I am putting on a conference for about 500 people in a large hotel conference room and would like to take my own PA system. I might be having a music session with 2 guitars, 2 vocals, and 1 piano. Mostly I would be having speaking workshops. I need: 2 wireless microphones (for main session room filled with 500... show more I am putting on a conference for about 500 people in a large hotel conference room and would like to take my own PA system. I might be having a music session with 2 guitars, 2 vocals, and 1 piano. Mostly I would be having speaking workshops. I need:

2 wireless microphones (for main session room filled with 500 people)
Speakers for main room
Mixer board with option to input sound from a laptop
Setup for 2 smaller breakout sessions (mics, speakers, mixers)

Also need to be able to upgrade the mics if I need to add a few more.

About how many watts do I need for this many people, want good quality but not a 10k system. Need it to be fairly portable as we will be doing these events nationwide. Thanks so much for any help!
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