This event repeats every year forever
AMIS stands for Atari Message Information System. It's one of the earliest bulletin board programs for the Atari (8-bit) computer.
The exact release date of AMIS is unknown, however, the June 1982 issue of Antic Magazine (Volume 1, number 2, page 25) reports that the Michigan Atari Computer Enthusiasts (MACE) have developed a bulletin board program for the Atari (8-bit) computer. Antic also mentions that its staff is helping MACE improve and distribute the BBS program to other Atari Users Groups. The BBS software is unnamed in this issue of Antic, however, it is probably an early version of the AMIS BBS software.
Antic does not mention the BBS again until its May 1983 (volume 2, number 2, page 92) issue. By May 1983, the program is called AMIS and Antic notes that it is the most popular Atari BBS program at that time. It is also a public domain program that was frequently modified. In some cases, it served as the basis of other BBS programs.