Happens this weekend. Official website here
http://www.scubainthepark.com/ . The Lilly in a current dive, but much warmer than you neck of the woods (upper 60's to low 70's in Spetember). It's in Brockville, so not close to the Sault.
I didn't see anything about a cleanup. Will have another look. Is it a diving cleanup, or a walk the shore and wade cleanup. Was thinking if we got an early start from here Saturday, we could be in Brockville by lunchtime (instead of rushing down Friday night and setting up a tent in the dark). Could check in, pitch camp (doesn't take long in daylight) and go dive. Wonder if we could sang another charter someplace Sunday, before we trek home. Or I suppose we could shore dive the Rothesay (watch me talk myself into this trip
).