Yes you do have to make a appointment but I don't know what days as we did a weekend.
We did Christmas ornaments and they are busy during the holidays. They have a good,website with all the info you need!
I'm pretty sure you can make an appointment. They don't blow glass on Mondays or Sundays. I've seen them make ornaments with kids during the holidays. It's fun!
We just happened to get lucky and visit on a day with little traffic - I suggest you contact owner to explore personal appointment
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