To-do checklist plug-in wanted

I maintain a web site for a music venue and add new events every week. I also post those same events to a variety of local sites to increase awareness and therefore attendance. It is easy to add multiple events to the web page then forget which ones I’ve cross posted to other locations. I’d like an admin-viewable checklist plug in I can use on each Event page so I can check which venues each event is listed on. I’d need the actual checklist items to be modifiable so I could list specific to-dos. Does anything like this exist? It could be as simple as something like this:

Event: Fusion Jazz Trio on stage <– event added to web site

Checklist:
[ ] Newspaper
[ ] Online Weekender Calendar
[ ] CitySearch Events
[ ] Chamber Calendar

My to-do list is eating my brain. I hope someone can help!