I personally couldn't find any place in Prague to pay by Lightning. Other than at the venue during BTCPrague.
Have a look on the BTCmap.org to find a place. https://btcmap.org/community/dvacet-jedna-praha
Qerko places will be added soon (I hope) Discussion about Qerko tags
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Qerko has a decent footprint in Prague. The benefit here is the venue doesn't care what you pay in.
Though ideally, they could just accept sats, like they would accept cash.
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