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Mobile Party Packages
What to Expect Before the Party:
Once Upon a Slime arrives 30 to 45 minutes before your party to get everything set up and ready to go! 🫧 We set up both indoors and outdoors, so your venue is never a problem.
What We Bring:
All supplies, tools, and ingredients are provided. All your venue needs is a clear space for the magic to happen. Need tables? They are available as an add-on!
How the Experience Flows
Once we are set up and your guests are ready, we guide everyone through the science and sensory process of making their very own themed slime from scratch. Every slime is customized to match your party theme, so no two experiences are ever the same! ✨ Each slimer mixes, creates, and takes home everything they make. When the fun is done, we handle all the cleanup so you can enjoy the celebration without the mess!
Who It's For:
Our experiences are perfect for slimers ages 3 and up. Choose from packages for 8, 14, or 20 guests, and the birthday person always slimes FREE as a bonus on top of your package count! 🎂 Individual slimers can be added on after your package is selected.
Package Time Breakdown
✨ 1 Slime: 1 themed creation, approximately 1 hour
✨ 2 Slimes: 2 themed creations, approximately 1 hour 15 minutes
✨ 3 Slimes: 3 themed creations, approximately 1 hour 30 minutes
✨ 5 Slimes: 5 themed creations, approximately 2 hours
Personalization and Special Requests
Have a theme, color palette, or special request? Drop it in the Special Instructions section at checkout and we will make the magic happen!
After You Book:
Once your booking is confirmed, you will hear from us by email and phone to introduce ourselves and confirm all the details for your party. 💛
Looking for Something for a Bigger Group?
If your guest list is growing, check out our Slime by the Hour packages! Designed for groups of 25 or more, our hourly experience is a condensed, fast-paced version of the full slime process that keeps the energy high and the fun going without slowing down your celebration. Same great experience, just on a larger scale! Available for up to 50, 75, or 100 slimers per hour in Basic, Plus, and Pro tiers.
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Get to Know Your Vendor
About Once Upon a Slime
We're here to help you plan the best party ever... the easy way!
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Email us with questions
Email us at info@confettijar.com and we'll get back to you as soon as possible.
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Chat with us
Chat with us and one of our team members can help you with party planning, booking, and more.
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FAQ’s
Got questions? We’ve got answers! Check out our FAQs.

Book with Confidence
When you book through Confetti Jar:
- Your booking is confirmed within within 24 hours, with some vendors offering instant book. This will always be noted on the offering page so you know what to expect.
- Your vendor will be in touch leading up to your event.
- You will have clear communication throughout the planning process.
- If a vendor needs to cancel, we will step in and help you find a replacement from our network so your party stays on track.
Parties for Kids & Teens Made Easy and Oh So Fun
FAQs
Please read our FAQs page to find out more.
What happens after I book?
Your booking request is sent directly to your vendors. You’ll receive an email confirmation within 24 hours securing the date and time of your event so you can start planning with confidence. If your vendor is not available, your card will not be charged and we can help you find another option for your event.
For packages over $400, Confetti Jar collects a 50% deposit at the time of booking. The remaining balance will be automatically charged one week before your event.
Your vendor may also reach out to confirm final details, discuss personalizations, or review any questions submitted with your booking.
Then, you are all set and ready for a fabulous celebration!
How far in advance should I book?
We recommend booking as early as possible, especially for weekends and popular party times. Many vendors book out several months in advance. If your preferred date is available, reserving it now to secure your spot!
What time should I select when booking?
For most bookings, select the time you want your party to begin. For entertainment, choose the time you’d like the activity to start. Your vendor will follow up after booking to coordinate arrival and setup details to ensure everything is ready on time.
Will the vendor contact me before the party?
Yes. Your vendor may reach out before the event to confirm details, review any special requests, and make sure everything is set for the celebration.
Do vendors bring everything needed for the activity?
Most vendors bring the supplies, materials, and equipment needed for their package. The package description will outline exactly what is included and anything the host may need to provide.
How much space is needed for the activity?
Space requirements vary depending on the type of entertainment. Many mobile vendors can set up in living rooms, backyards, or community spaces. Review the package details for any space or setup requirements.
What if I need to reschedule my party?
Rescheduling policies vary by vendor. Review the Cancellation & Rescheduling provided by each vendor.
What if I need to cancel?
Cancellation policies vary by vendor and will be listed on the package page. If you need to cancel your event, please review the vendor’s cancellation policy or contact Confetti Jar support for assistance.
