Sentence:  It's currently possible for true devotees to find a science fiction convention to goesic to fifty-two weekends a year; often there will be up to a half-dozen choices, ranging from large, general conventions, to smaller scholarly conferences or "<WSD>sercons</WSD>," to specialised get-togethers for fans of feminist Science Fiction, military Science Fiction, gaming, "Star Trek," and so forth. 
Meaning of the word marked with <WSD> tags:  A sercon activity; a serious and scholarly activity.