In this video I explain that 2Thess.2:3 shows two distinct events separated by the comma. The same thing happens with Isa.61:2 and LK.4:19, where the two advents are separated by a comma. The Rapture happens and begins the Day of Christ
The Day of Christ is happening in heaven (the judgment seat of Christ) while the Tribulation is beginning on the earth and the anti-Christ is revealed.