Boxing Illegal

Does anyone know if i can host a boxing tournament or sparring in my backyard without it being illegal.
Using headgears, gloves, asking permission, etc

I don't see why it'd be illegal, but then again, some shithead could try to sue you if someone got hurt.

Whilst your efforts to make this as safe as possible should be applauded, you will be in a world of shit if someone were to get hurt doing this. It sounds like you have a group of friends who are all into boxing, instead of making a club, join one ;)

where do you live

Memphis is right. Do it properly.