Hello Chris,
As the correspondent for the Augusta Birding Club I encourage you to check out good local birding spots on our website
here.
You'll be quite close to the Messalonskee Lake site and none of the others is far away.
I'm sorry that we don't have any organized trips planned while you are here.
eBird will be a great resource of course and one of our members created
a Kennebec County checklist that will give you an idea of seasons and regularity of occurrence.
You may also hear directly from individuals who are birding as a result of your posting here.
Hope you have a great time!
Cathie Murray