missing the moonlight underbridge bat-viewing canoe expedition

Yesterday morning Erik went hiking with S. Then before 10 our friend P called inviting us to a moonlight canoe expedition to see some bats under a bridge. I thought Erik might be home early because S hasn't hiked much and I thought he might want to turn back early. But that wasn't so--Erik was home about 40 minutes after P left for the preserve. So we missed it.