Why not download the poster and put it up around your institution? You can also retweet it.
You can still buy tickets! If you are travelling with a partner or companion, you can buy a separate dinner ticket for them.
If you are interested in volunteering at CarpentryCon, please add your details
to the volunteers pad, which also explains what kind of help is needed. Download and display the new poster to help publicise the event locally.
Community CarpentryCon 2018 Community Building