Enough milk?

My sister invited me to go to this baby exhibition tomorrow, it's basically this huge baby show with a bunch of vendors that give out free samples, you can buy products, etc.

I'm considering going and leaving my hubby to watch our son for the afternoon. I haven't had a break since my son was born. I'm nervous to go and leave him although he'll be with my hubby. I just have this awful mom guilt and feel so bad leaving that's why I don't go anywhere and or do anything for myself 😂.

My question is:

1) Should I go and just enjoy myself without baby for once and try and have a good time? I'm literally trying to come up with any excuse to NOT go.

2) I have some milk stored in our freezer, it's approx 10-12oz. I EBF but our son takes a bottle very well. I'll be nursing him quite a bit before I go (if I actually end up going). I would be gone from about 10-3ish and just worried if this would be enough milk or not.

What do you ladies think?