* -ship: Attendantship (the state of being an attendant)
* -cy: Attendency (the act of attending or being present)
* -er: Attender (a person who attends something)
* -ing: Attending (the act of attending)
You can also use prefixes like "un-" or "non-" to create words like "unattendant" or "nonattendant."
Ultimately, the best suffix to use depends on the specific meaning you want to convey.