Well, you should always create the event in your account to trigger the licensing process.
If the DJ set includes only Soundreef tracks, your organizer will need to apply for a LEA license.
If a mixed repertoire is played instead (including songs managed by SIAE), we'll collect your royalties indirectly: the organizer will request a permit from SIAE which is entitled to collect royalties for our right-holders for this specific type of use.
Then, SIAE will report us the data for the part we manage - that's why you should fill in the SIAE digital borderò.
To let us know that you'll play at a mixed DJ set, make sure to enter the firstname.lastname@example.org in the organizer email field.