Evening dj not starting till 7pm

Hi everyone so we spoke to the pub today where were having our reception and theyve told us that the reception starts at 5pm but the dj doesnt start till 7 but were getting married at 3;45pm and were having a register office so i know there roughly 20 mins long my question is this do people think that we would need to hire any more entertainment while we wait for the dj or do u think with the timing of our ceremony aswell as pictures afterwards and the food starting at 5 and speeches we would be ok not to hire anything else thank u