For ideas on activities, crafts and the like, check out my favorite Catholic crafty homeschool mom Lacy's suggestions, which I am re-posting below:
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Michaelmas comes every year on September 29. It is the feast day of St. Michael, St. Gabriel, St. Raphael, and well- basically the Archangels :-) When getting ready to celebrate Michaelmas with your kids, think "tough angels". Because that's what archangels are. Save your "fluffy angel" ideas for the feast of Guardian Angels in October.
I love this Angel Mobile Craft from Bountiful Blessings.
If you're not crafts enough to cut the pieces out like she did,
Charlotte has a Printable Page of these Kitchen Angels.