Discuss formulas, functions and VBA (Visual Basic for Applications). I have useful formulas posted at ExcelJedi.blogspot.com Try other ways of working with data, such as: an Excel Add-In, GoogleSheets, Tableau, SAS, Libre Office, d3, Python, MatLab, R, C, C++, C#, F#, SQL, noSQL, Haskell.
At our monthly Excel meetup, you may hear of references to online resources, like www.bettersolutions.com Afterwards share with other members, regarding other data tools, like: Google Big Query, Microsoft Access, FileMaker for Mac, MySQL, Postgres, MongoDB.
Also discuss Comma Separated Value problems here. Sometimes these files are opened and interpreted poorly due to the General Format setting in most spreadsheet software. Visit the group to learn about work-arounds to various CSV problems.