I know there is a way to sell the tickets you won't use, as people do it all the time. Forums like these, the gymcastic podcast forums, and gymnastics groups on Facebook will be your best friend. The college gymnastics fans are here group is a good one, you could also ask those at your club. I think men and women typically cost the same so if you were trying to sell 2 of your 4 sessions, you would price it about half, maybe more or less depending how demand goes. You might be able to do it at the venue during the event...people definitely do that for concerts. I haven't been to an elite meet since pac rims 2016, which definitely wasn't sold out, and before that it was 2003 nationals and I don't remember much except being completely star struck. I was the happiest 12 year old ever.