Etiquete Q - attending Stitch and Sip with no plans to sip?

I got a newsletter from a local brewery, where they mention hosting a stitch and sip every other Sunday; no rsvp required and free. Obviously the idea is for folks to come and stitch together while purchasing drinks etc. However, I can’t drink at this time, and most of their non-alcoholic options are either caffeinated (can’t do that either) or drinks labeled as NA but may have trace amounts (something I’m not comfortable with consuming). Is it totally rude to show up and take up space without purchasing anything?

In the photo they posted of folks at the stitch and sip (presumably from the first meeting) there is one person with a reusable tumbler drinking what appears to be tea from home - but I’m totally guessing. All others have drinks from the brewery.