I would not clump unrelated items just to reduce the listed EC’s in your Common App. The Common App itself helps you self sort by requiring you to list the years of participation, when the activity occurs and hours you spend per week and how many weeks. It also asks for leadership positions, accomplishments and recognition. Remember each AO on the first read has limited time in reviewing each app. What do you want to be memorable about you, you have maybe 10± minutes of their attention for your entire app for most of these schools.