Here's what rhymes with brainstorming.

Consider these alternatives

brainstorm / rainstorm sessions / presence devising / rising seminar / far reminiscing / living convened / seemed sketching / getting improvising / rising meetings / teachings convening / meaning creatively / qualitatively summarize / size trilateral / natural roundtable / cauxroundtable attendees / these socializing / rising devise / size formulate / late debriefing / leaving convene / seen collaborative / native informal / normal musing / using