This is easy.
Have you considered a big “recap talk” to finish out your year?
Or do you have another recap method up your sleeve – a great email, a well-designed handout or “poster,” a video message students can return to a few times this summer… maybe even a devotional that makes students examine their progress on what they learned across the year.
It’s worth asking if one more new talk would have more impact than a reminder of what God’s been teaching this year. In some cases, something new might be just the ticket.
But if not, reminders can go a long way. Maybe all the way to August.
Of course, you could also summarize all the big group learnings in your small groups. Or recap the small group studies. Or both.