One of the nice things about this site, particularly the Fort Worth forum, is there are multiple ways to get the word out about your availability. If a lady is generally able to keep regular hours, she can post those in her profile, ads etc., then use the Companion Ads forum to keep her name out there. If a lady has a widely varying schedule, she can state the same in her profile, sig line, etc., then use the daily ad section to let guys know she’s available that day.
Fort Worth has one more advertising tool not available in Dallas: the SNATCH thread, which isn’t used nearly enough. If a lady suddenly finds herself with an unanticipated opening, she can post on that thread that she’s available now or during a short window. You can’t post full ads on that thread (the reason it’s not available in Dallas is that the ladies there weren’t able to follow the rules), but it’s a nice additional tool in the tool kit.
I know that doesn’t solve the problem of “things happen”, but this site does offer alternatives to help tailor one’s marketing to better fit other obligations.