☀️ Summer parties filling fast! May–August dates are booking up — lock in your date before it's gone. Book now →
☀️ Summer Slime Season is Here

The slime party that lands at your door

A fully-stocked slime cart shows up at your kid's birthday party. We run the whole thing. You don't lift a finger.

Book Your Summer Party → See how a party works → Have questions? Read the FAQ
1.5 hrs
of hands-on slime fun
20+
cosmic mix-ins and toppings
100%
setup and cleanup included
How It Works

Book it. We show up. Kids go cosmic.

01

Pick Your Package

Choose the party size and vibe that fits. Galaxy, glow-in-the-dark, rainbow, unicorn, or go custom.

02

We Show Up Ready

Our slime cart arrives fully stocked — glue, activators, colors, glitter, charms, beads, scents, and aprons.

03

Kids Create, You Relax

Every kid makes their own cosmic slime to take home. We guide them through it, handle the mess, and pack up clean.

What's Included

Everything comes with us — supplies, setup, and a slime expert

✅

Full Setup & Cleanup

We arrive early, arrange everything, and leave your space exactly as we found it.

🎨

All Supplies Included

Glue, activators, colors, glitter, charms, scents, aprons, take-home containers — nothing to buy.

👨‍🏫

Hands-On Instruction

Our slime expert guides every kid through making their own custom creation.

See all packages →
Packages

Parties that don't break the bank

Starter
$199 / party
  • Up to 5 kids
  • 1 custom slime per kid
  • 1 hour of slime-making
  • Basic mix-in station
  • Aprons provided
  • Full setup and cleanup
Select Starter
Most Popular
Deluxe
$299 / party
  • Up to 7 kids
  • 1 custom slime per kid
  • 1.5 hours of fun
  • Premium cosmic mix-ins
  • Themed decorations
  • Take-home containers
Select Deluxe
Ultimate
$399 / party
  • Up to 10 kids
  • 1 custom slime per kid
  • 2 hours of slime time
  • Glow-in-the-dark option
  • Slime goodie bags
  • Birthday kid gets VIP extras
Select Ultimate
Got Questions?

Everything parents want to know

How long does a Cosmic Slime party last?
Each party includes approximately 1 hour of hands-on slime making. The total time at your home — including setup and cleanup — is typically around 1.5 to 2 hours depending on the package.
What areas do you serve?
We currently serve the Lehigh Valley — including Allentown, Bethlehem, Easton, and surrounding areas. Not sure if we reach you? Reach out and we'll let you know.
How far in advance should I book?
We recommend booking at least 2 weeks in advance. Weekend dates fill up fast, especially in spring and summer — the earlier you lock in your date, the better.
What's included in each package?
Every package includes all slime-making supplies (glue, activators, colors, glitter, mix-ins), hands-on instruction from us, and containers so every kid takes their slime home. Higher packages add premium mix-ins, themed decorations, and more kids.
Do kids get to keep their slime?
Yes! Every kid takes home 1 custom slime they made themselves — in their own container. It's half the fun.
How does payment work?
Deposit depends on when you book: if your party is more than 7 days away, a $75 deposit holds your date — the remaining balance is due 7 days before the party. If your party is 7 days away or less, the full package amount is due at booking. The deposit always applies toward your total.
What if I need to cancel?
Life happens — we get it. The deposit is non-refundable if you cancel within 3 days of the party. If you cancel earlier than that, we'll work with you. Rescheduling is always an option.
Do you handle setup and cleanup?
Yes — 100%. We arrive early, set everything up, run the full slime session, and pack up everything when we're done. All you need to provide is the space and the kids.
About Us
👨🏼

Family-run, Lehigh Valley local

Cosmic Slime started with a simple observation: kids absolutely lose their minds for slime. So we built something better — we show up with a fully-stocked slime cart and run the whole party.

50+
parties hosted
500+
kids served
5.0
average rating
100%
cleanup included
Our Story →
What Parents Say

What Lehigh Valley parents say

Real families. Real reviews. The same slime cart your kid's friends already had.

★★★★★

Best party my daughter has had — the slime cart showed up and the kids were hooked for two straight hours.

Sarah M.
Allentown · Daughter's 7th birthday · Deluxe
★★★★★

Setup, the party, cleanup — all handled. I finally got to enjoy my son's birthday instead of running it.

Jennifer K.
Bethlehem · Son's 9th birthday · Ultimate
★★★★★

Every kid left with their own slime. The parents kept asking me how I found Cosmic Slime.

Tara W.
Easton · Daughter's 8th birthday · Deluxe
Book your slime party →
Get in Touch

Questions? We'll get back to you within 24 hours

☎
Phone
(484) 240-1156
Call Us
✉
Email
cosmicslimehelp@gmail.com
Email Us
🎭
Book Online
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Send us a message

Compare Packages

Not sure which package is right? See them side-by-side

Compare Starter, Deluxe, and Ultimate — duration, kids, and what's included.

Compare Packages →

Every kid deserves a party they'll never stop talking about

Cosmic Slime is bringing mobile slime parties to the Lehigh Valley. No venue needed. No cleanup stress. Just pure, colorful, squishy joy delivered to your doorstep.

(484) 240-1156  ·  cosmicslimehelp@gmail.com

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