Thanks everyone!
This upcoming service will be indoors, so I'm fine on that front, at least for now. They're fine to stand in. I made sure the toe box was big enough.
They seem a little flashy, that's the only issue.
Diana, yes I do have a pair of ballet flats but they're more like slippers...I think they're too casual. Thanks for the ideas on outdoor-appropriate footwear.
Joy, yes, these shoes would be good for aerating the lawn