Leaving baby for first time

[TheVeryHungryScreamerpillar]

My baby boy is 9 weeks and EBF. In the last few weeks we have tried him with a bottle of expressed milk and he will suck it but spits out most of the milk. Hubby has got us tickets for a boxing show and my FIL is happy to babysit but the show is 7pm-11pm and my LO doesn't usually go down until 8.30 ish.
Would it be okay for me to give him a big feed before I go and leave grandad with twice as much expressed milk as he'd usually take during a feed?
I'll only be a 20 min drive away so I can get home if necessary. I suppose I'm looking for advice, would you go? Is it too soon to leave him?

I suppose it depends on how willing grandad is! If he's happy to give it a go then I'd go. As you say you're only going to be 20 minutes away. There's no such thing as "too soon"really, for some people a year would be too soon, I left ds with my sister to have a half hour walk with dp when ds was two weeks old. Some people find that their babies take a bottle better off someone other than them anyway.