Looks like LenelS2 is out for ISC West 2021 now as well according to the email I got yesterday. Looks like they'll have reps there but no booth. From the email:
LenelS2 has made the difficult decision to not have a booth at ISC West 2021. With that said, we will have a team of representatives attending the event for customer and value-added reseller discussions, including networking opportunities
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