If you redirect to rise://, it will open Rise and bring it to the foreground.
If you want to jump to a specific event, there are two routes:
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If you know the event uuid (which is a unique Rise identifier), you can redirect to rise://?eventUuid=[event uuid] which will open the event in Rise.
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If you know the event iCal uid and the start time of the instance, you can redirect to rise://?eventIcalUid=[ical uid]&eventStartTime=[event start time] which will open the event in Rise. The start time is needed to distinguish instances of recurring events. The best way to provide the start time is in ISO 8601 notation, eg 2024-01-03T07:25:41Z.