Both Picture This and Dermot Kennedy's headliner gigs at Ormeau Park this June have been rescheduled until 2021.
The news comes as Belsonic seeks to reschedule its 2020 festival, due to measures to stop the spread of Coronavirus.
Athy pop-rock band Picture This, who previously headlined the festival in 2018, had been set to perform in Belfast on June 28.
They have now rescheduled this gig and will be performing in Belfast on Sunday, June 27, 2021.
Dermot Kennedy meanwhile had been scheduled to perform his biggest ever show in Northern Ireland at Ormeau Park on June 25.
He will now perform his Belsonic concert on Thursday, June 24, 2021.
The festival organisers have indicated that there will be further Belsonic announcements to come in due course.
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