In my area I check for events on the following types of websites:
City/County schools: graduations
Local Universities: graduations & home comings (Who would’ve thought little Winston Salem would have 3 universities & 1 Tech College—good rentals)
Local arts council
3 local film festival websites
Local convention center calendar
Plus there is the SE International Furniture Market is in High Point (20 min drive) so I keep track of its dates
I’m already booked for April 2018 Furniture Market & May 2018 Wake Forest University Graduation plus I have inquiries pending for when my calendar opens for May 2019 WFU graduation & August 2019 National Black Theatre Festival.
It sounds like a lot of website checking but University, Theatre Festival, & Furniture Market schedules are usually set 1-2 years in advance.