For 7/28, the two sessions gave mixed results. Both ran into some problems with timing.
The lesson part for the first session with 9-12 year olds ran over time. After going over the different word bubble types, I had them try drawing their own. This took longer than I expected, so the kids couldn't finish the activity portion, though they did get through the main lecture.
With the 7-8 year olds, they arrived late, so they only had time to finish the warm-up with no time for the lecture component.
These delays, plus lower attendance, caused the 7/28 sessions to have fewer comics. The overall numbers:
Comics collected: 231
Student efficiency: 6.42
Maximum possible produced: 305
Lesson efficiency: 0.76
For the sake of simplicity, I'm only going to break them down into separate sessions when there's a significant difference in their content. For example, 5-6 year olds are taught different things from the older kids, so they would be counted separate.
Based on the timing issues here, I realized I needed to shorten the warm-up period for the 7-8 year olds. For the 9-12 year olds, I'm going to skip having them do practice drawing runs and instead go straight from warm-up to lecture to activity. These modifications will help with time management.