Join is transitive so requires an object.
It is and does in this context, but there are intransitive uses, e.g.: 'We offer membership, do you want to join?'
It is and does in this context
@Oliver Schick started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
It is and does in this context, but there are intransitive uses, e.g.: 'We offer membership, do you want to join?'