So you’ve figured out most of the details for your company picnic/party. Before you push your chair back and kick your feet up on your desk, remember that you need to inform your company about your party. You know what they say: a party isn’t a party without people.
There are several ways in which you can inform your co-workers about your party. If your party is fairly formal, you may want to send out individual invitations to your co-worker’s homes. If your party is a casual picnic, you can get creative with your invitation.
Invitations for casual parties/picnics can come in all shapes and sizes, but first: we’re going to show you some things you shouldn’t do.
This may seem like a good idea initially, but we can assure you, it’ll be cute for 3 seconds and then your CEO will walk by and rip it off the walls:

You may want to save trees and cut costs – so you want to send an e-mail? Here’s what not to do:

Maybe you want to create your own in-house flyers with your word processing software. Here is what not to do:

I understand the idea behind creating your own invitations but you want your invites (no matter how formal or informal) to be classy and tactful. You also want them to be inviting, as you should hope these invitations inspire your co-workers to come!
Depending on your budget, I would consider outsourcing your invites if you want to do individual invitations to your co-workers. I think this is the most personal and welcoming way to invite your company to a party.
Stephlynn, an Etsy designer, created these simple yet sleek invites for a company’s Christmas Party.

For $30 you can get a print ready file from her and print them in-house.
If you have an in-house designer at your company, why not work with them to help you design either personal invites or fliers to hang up around the office.
Whatever your style, make sure that your invites are classy and pertain to your company’s environment.