This seems to be a common pattern with Mr Land when he is overloaded. He stops communicating. My bet is, you'll get your shoes, but maybe not in time for the event.
My most recent pair was ordered in person, custom measured at an event, during the winter when things are slower. I was told I would receive them in two weeks. Four weeks later, I wrote, and received a message that said all orders from that fair would be shipped by the end of the week. In the text of my message I reminded him that I needed them for a particular event, and as I would be walking extensively, I needed time to break them in.
Two weeks pass from the new ship date. I inquire, and get a 'they will be shipped on X date and arrive by Y date. Okay, still time for me to break them in if I apply myself.
They showed up on the day I left for the event. My caretaker called me on the road to tell me they were in. A later review of the shipping information showed they were shipped on the date he'd told me they would arrive.
Meanwhile, I did the event in an old shredded pair of Fugawees with flapping soles, held in place by a pair of Tingley rubber overshoes I purchased from Ezra Barnhouse Merchantile.
And, my new Robert Lands are proving to be great shoes for me in mow with, as it's haying season here. In fairness, these are a shoe he had in prototype form, and had not gotten into full production. They are still not on the website.
And, when last I inquired, the shoes my friend ordered the same day I ordered mine still had not arrived, more than a month after mine came.
The Tingley overshoes were a decent solution to my shredded soles, but they will be hot at a summer event. If you choose that short tern solution, Several vendors carry them in the period style. If you know what to look for, they can also be found at some BigBox farm stores, such as Tractor Supply.