On Friday, police said multiple arrests were made at various locations in Sarnia, related to missing man Bradley James Ogilvie.
Encampment protocol additions specific to Rainbow Park will be considered by Sarnia council on Monday.
The open house will be held on Friday from 3 p.m. to 6 p.m.
It's hoped thousands of people will flock to Mike Weir Park in Bright's Grove on Saturday for the 42nd Rotary Art in the Park.
The garbage cleanup on Saturday, September 7 is on from 9 a.m. to 11 a.m.
The homeless encampment at Rainbow Park and drugs are concerns being highlighted by Sarnia residents.
Like always, it's the first fall fair of the Lambton circuit, and this year's theme is "Wish Upon a Fair".