Those are very lovely. The fact that it's in a field, all depending on the weather, but your feet may get pretty muddy in those open shoes. Boots with heels or wedges are very in fashion at the moment, try get your hands on some that are like the links below. Good luck 馃憤.
Those shoes are soooo pretty, but they might sinks a bit. If I were you I would go and look for a pair of cute wedges.
ooo they look classic totally get them! you can also look for wedges which won't sink in either
they're really pretty :D