How to reject a dinner invitation ?

Its never a good idea to reject an invitation for a company wide dinner. It comes off as you either don't like your fellow employees, or you don't want to spend time with then for some other reason. And not replying is the worst, at least make up an excuse but don't ignore the invitation.

You should go if you plan on staying with the company as non-attendence will hurt your chances of moving up in the organization.

You need to respond, so they can PLAN, and prepare the food. So stop being rude.

The way to decline any invitation you don't want to accept is "Oh, I'm so sorry, I can't." Don't give any specific, actual reason.

You can't help that they want you to go, but you won't go.

I think you're unwise. It would be wiser to go. You know everyone there, right? Or at least many of the people, who you deal with every day.

But you need to give SOME answer, either way, right away. It's rude to refuse to respond at all.

They need to know how many people they are feeding.

As for "being in large groups" you can lurk around the edges, and make chit-chat with one or two people near you, and with your dinner neighbors.

But if you really hate the idea tthat much, "I'm so sorry, but I won't be able to attend."

Yes it will look bad for you if you don't go. Your boss will feel slighted and when you want something down the road, chances are you won't get it. Especially a promotion. Just go, be gracious and fun. Schmooze without losing your dignity.

wow...just say you already had plans with your family or family is in the hospital if you really must avoid that much social interaction with your company. just say yes or no, that's all they need to know