Volunteer members of Mayo Mountain Rescue responded to a total of 38 call-outs between March and October last year.
Reek Sunday is treated as one call-out, with 17 incidents recorded on that day alone last year.
As one of the busiest teams in the country, the Mayo Mountain Rescue Team needs to fundraise to meet its operating costs, and fund first-aid equipment and training courses for volunteers.
The team is holding a fundraiser called "Moonlight in Mayo" on Saturday week next 23rd March.
Members of the public taking part will be brought on a guided night-time 12 kilometre walk on the Letterkeen Loop.
This is the third year of the Moonlight in Mayo event.