The second conclave was also held in Alton, with Alpha Chapter as host, on May 21, 1927. By this time the society had been incorporated as a non-profit organization under the Illinois Statutes, and was able to inaugurate a policy of limited expansion as a national society.

Largely through the efforts of Dr. Carleton, petitions were received from groups at the Medical College of Virginia, in Richmond, and from the Northeast Missouri State Teachers College, in Kirksville. Both the petitions received favorable action and charters were granted to Gamma and Delta Chapter.

It was voted at this meeting to hold the national meeting biennially. Accordingly, no conclave was set for the following year, 1928. However, an informal meeting which was designated as the third annual conclave, was held at Shurtleff on May 13, 1928, to elect officers for the following year.

In 1929, the fourth conclave was held at Kirksville, Missouri, with Delta Chapter entertaining the delegates. Three petitions were received at this meeting, and charters were granted to Epsilon Chapter at Otterbein College in Westerville, Ohio; to Zeta Chapter at Central State Teachers College in Stevens Point, Wisconsin; and to Eta Chapter at the Southeast Missouri State Teachers College in Cape Girardeau, Missouri.

The first issue of SIGMA ZETAN was printed under the date of April, 1929, with the note that it had been edited by Professors List and Carleton at Shurtleff. It was a three fold sheet of newsprint, printed to make a 9x6 inch bulletin. Assembled in it were reports of chapter activities and alumni notes, as well as an editorial on the place and function of the society as an honor organization. This was followed by a statement on the progress made during the years following 1925. The Sigma Zetan was recognized as the official publication at the 1930 conclave, and the first Grand Editor was elected at that meeting.

By 1930, after five years of substantial growth, Sigma Zeta had chartered seven chapters. It had survived the perilous formative years, so critical in all such organizations, and had matured on a substantial basis. It was prepared for the problems of its growth in size, standards, and policies. The Gavel was constructed and presented to the society in honor of the first seven chapters.