Nah you’ve got to get in early with that introduction bit (assuming these aren’t people you work with) and say something like you’re a bit knackered as you were doing a marathon for a leprosy charity yesterday or something marginally more credible so no one can really say anything if you aren’t contributing a lot. Make up anything. You volunteer one night a week for the Samaritans, newborn kept you up. Doesn’t matter.
My sister is married to Rob Brydon, gets everyone banging on about Gavin and Stacey for ages and I'll go have a brew.