I guess this is something only true Friday the 13th geeks can appreciate. It's a Boy Scouts conference patch for Camp NoBeBoSco, also known as Camp Crystal Lake for 1957. As we all know is that 1957 was the year Jason drown while the camp counselors were off doing the naughty.
Maybe Mrs. Voorhees had it all wrong and the counselors were actually attending this conference? I guess we will never know the answers to that because all of the witnesses were brutally murdered in 1958!