@Ssmiler congrats on having a date. The new surgeon sounds much more clued up which bodes well. But, what @Madagascary said. It's 'possible' you would feel OK to do this ... but the chances are very low indeed. You need to be prepared to literally do nothing other than potter about for at least the first week post surgery.
For ref I'm a pretty fit/ very active for my age [53 at time of surgery] and I did literally nothing other than get up/ eat and potter for at least the first 4 days. I did my first very gentle walk round the block on day 5 I think. You'll always read stuff about people who say they bounced around like nothing happened and were doing the school run within a week, but, yeah I really don't believe that. It's MAJOR surgery.
If you don't want to keep postponing, explain to your son/ find another way/ time to celebrate perhaps?