Now I know you can only connect to one Bluetooth device at a time, but if you use the audio port of your device (Phone, laptop, iPad) you can use a 3.5mm splitter and put a Bluetooth transmitter on the end of each splitter. Thus, receive sound output to two Bluetooth headsets at once.
how-to-fix-earbuds.blogspot.com/2012/01/how-to-connect-two-bluetooth-headphones.html
