Recent uses can take an hour or so to appear here.
customEvents | where name == 'popPetals' and timestamp > ago({days}d) {projectFilter}
| summarize pops=count(), popUsers=dcount(user_Id) by placePop=tostring(customDimensions.place)
| join kind=fullouter (
customEvents | where name == 'presentSlidesOrEdit' and timestamp > ago({days}d) {projectFilter}
| summarize opens=count(), openUsers=dcount(user_Id) by placePresent=tostring(customDimensions.place)
) on $left.placePop==$right.placePresent
| project place = iff(placePop != '', placePop , placePresent ), pops, popUsers , opens, openUsers
| sort by opens, pops
customEvents
| where timestamp > ago({days}d) {projectFilter}
| summarize Distinct_Viewers = dcountif(user_Id, name=="popPetals")
customEvents
| where timestamp > ago({days}d) {projectFilter}
| summarize pops=countif(name=="popPetals"), opens=countif(name=="presentSlidesOrEdit"), user=any(user_AuthenticatedId), browser=any(client_Browser) by user_Id
| sort by pops, opens