Like any event, you should plan ahead. While a children's birthday bash may not need the extended timeline that a wedding does, it's still a good idea to contact me at least two to three months before the scheduled party.
Even if you haven't set a date or place to hold the party, just getting the design process started ahead of time is a good idea. It gets the ball rolling, and hopefully once you do pick a time and place to host your child's birthday, we've already got the invite design mostly done, and I can just pop in the missing information.
While I would love to undertake every party and event that comes my way, it is incredibly hard for me to accommodate rush jobs. For events that need 10–30 invitations, please contact me at least two months beforehand. For events that need 31–50 invitations, please contact me at least three months beforehand. Anything larger than 50 invitations should be given a timeline of four to six months before the planned event. You should allow a minimum of two to three weeks for printing once you've approved the final invitation design. And remember, specialty printing such as metallic inks, letterpress, and hand-cutting can add to the length of time for project completion.