Random help - hen night

Hello everyone, newbie here.
Me and a small group are arranging a friends hen weekend and we figure she should be treated (think spa weekend, nice meal etc) but also should earn it! Hence hello!
I am looking for a little bit of help as to how we could arrange a little session for her to be messed by the rest of us. Anyone who may have a location, etc.
Also what substances are good / bad for this so as not to ruin her hair in advance of the big day!!
Please drop me a little private message with any ideas just on the very slim chance she ever found this before the event!
Thanks
Jen
Me and a small group are arranging a friends hen weekend and we figure she should be treated (think spa weekend, nice meal etc) but also should earn it! Hence hello!
I am looking for a little bit of help as to how we could arrange a little session for her to be messed by the rest of us. Anyone who may have a location, etc.
Also what substances are good / bad for this so as not to ruin her hair in advance of the big day!!
Please drop me a little private message with any ideas just on the very slim chance she ever found this before the event!
Thanks
Jen