It is difficult in the heat of August to think that Fall is starting. In Ohio we have at least another month of summer like conditions to go at the beginning of August, so for me Lammas is less a Fall/Harvest festival than it is a celebration of the continuation of summer. It is the time when all the county fairs begin, and when the schools are getting ready to open again for the school year.
Lammas is a bright golden sunny holiday; it brings with it the glance of fall that comes when you think of children going to school, football games, and bonfires at night. Corn is not quite its ripest or sweetest, but it is working toward it. August is when you start to work overtime to do all the fun summer things you wanted to get in before the season was over. Lammas is a warning that your summer is winding down, and your autumn is on the horizon.
Enjoy the last days of your summer. Go to a baseball game, eat a popsicle from a truck, go on a picnic, do all the things that make summer what it is.