Cocktail attire, but dress comfortably....you don't need high heels or a jacket and tie.
If your invitation states "and Guest" then yes.
We completely understand your concerns and don't want anyone to feel uncomfortable about attending. All we ask is that you respond "No." Please don't respond "Yes" hoping things may change and then back out at the last minute. We need a guaranteed number of guests 3 weeks prior to the wedding.
For those responding yes, we will contact you and let you know what alternate plans we are making.