When should the invitations go out?
The bachelorette party invitations should go out at least one to two months prior to the party. The rule of thumb is that if you are going out of town for the party, give the girls at least 2 months to prepare for the trip, especially if they have a significant other or kids. I have heard and have received bachelorette party invitations sometimes 3 months in advance, especially if it is in Vegas since the rooms sell out so fast.
If the party is in town, give the girls at least one month in advance to be told about the party. Girls may have children or big children (husbands/boyfriends) to make arrangements with to save the date.
Get the money up-front! Just because you are planning the party does not mean you have to pay for the bachelorette party, even the bachelorette party invitations, by yourself! Copy this page and show other girls who think that they don't need to chip in that THEY DO! You are doing your part in planning the party and each girl should chip in some money. It would be great to add up the possible expenses, including everyone paying for the bachelorette (who should not pay for anything). Give each girl the amount you need and state that they need to pay in advance or when they show up! There are so many occasions when girls may say "well I don't have the money", "I will pay you later", "I forgot my wallet but I promise to send it to you". Most likely you will not get money from them and so it is important so you can have a good time that you don't have to think about the money so get it up front!