Keep a good record of everything
Start an excel sheet with all the name of girls invited, their Email or Phone number (Web texts are great!) then mark them in red if not coming and green if they are.
Due to the fact that there is usually 2 ore more people involved in the organizing of a Hen Party we would recommend setting up an email address specifically for that Hen Party “SharleensHenParty2017@gmail.com” create a password for that email address and give it to the organisors and only the organisors.
Do ALL correspondence through this email to your suppliers and guests. If you have a conversation with the hotel about something follow up on an email so every organisor can see this in the email trail. To make it less confusing reply to each supplier on the back of the last email in their thread so it reads as a story instead of various emails.