Taking baby out after bedtime

My fiancé is an amateur artist working towards making a career out of his passion. Tonight is his first exhibition and I was looking forward to attending but unfortunately my mother (who was going to babysit) has been struck down with the flu and no one else is able to help out. Usually we'd take it on the chin and he would do his own thing or go with friends but this is really important to him and he's getting very anxious about being there without me. He's just called to say that he feels really silly and pathetic but I'm the only one who has been there supporting him and his art journey from the beginning and he's thinking of just coming home because his anxiety is getting so bad. I've tried talking him round but there's only so much I can say over the phone especially when most of my attention is on the baby.

His exhibition starts at 7pm for an hour and a half and I'm thinking going along and taking the baby with me. I'm normally pretty strict with his bedtime routine (he's in bed by 7:30pm) but I'm torn as this is such a big deal for my partner. Only this morning I said too that I think we should change the baby's bedtime to 8pm because he's been waking up super early lately and seems to be getting tired later in the days, and I thought he was going to skip his usual afternoon nap today (usually around 3:30pm) as he was not tired at all but it's just gone 5pm and he's literally just fallen asleep eating a snack so there's no way he would be asleep at his normal bed time anyways. Would it be so bad for just one night?

Torn ☹️