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No, you do not need to report those Kansas sales to Missouri for sales tax purposes.

Sales tax is generally sourced to where the transaction takes place, meaning where the service or product is actually delivered or performed. Since your craft workshops were physically held in Overland Park, Kansas, that is where the taxable event occurred. You already did the right thing by collecting and remitting Kansas sales tax there.

Missouri sales tax would apply to sales you make within Missouri, to Missouri customers, or potentially to remote sales if you have significant economic activity in the state. But sales of tickets for events physically occurring in Kansas fall outside Missouri's jurisdiction for sales tax purposes. Missouri has no claim to tax a transaction that took place entirely in another state.

One thing worth confirming: Missouri does not impose sales tax on most services, including many classes and workshops, so even if you were somehow considered to have Missouri nexus for this activity, the transaction might not be taxable there anyway. That said, since the workshops happened in Kansas, this is mostly a non-issue for Missouri.

Just keep good records showing the workshops were conducted in Kansas, the sales tax was collected at the Kansas rate, and you remitted it to the appropriate Kansas authority. That documentation protects you if either state ever asks questions.