In a few days, we are going to be many friends that will gather together and play all night long using 6-7 APs.
How can I DeAuth/Disconnect everyone's connection, without being connected to their network?
airodump-ng you can create a csv file containing all clients and APs detected. Feed this csv to
aireplay-ng and deauthenticate them.
But if the APs in the question supports the 802.11w specification, your deauthentication packets will be ignored.
Using NetAttack2 you can de-auth ALL networks around you or you can select what you want to de-auth. This is how you set it up.
git clone https://github.com/chrizator/netattack2
chmod +777 netattack2.py
7 depending what you want to do.