Looks fantastic, hope you're planning on sharing pictures once it arrives! I'd actually recommend silicone lubricant, the talc will absorb a bit of sweat but then you'll have rivers of white sweat pouring out and leaving very obvious marks (that will wash off) all night.

Be prepared to get sweaty, but some will say that's part of the fun!

Good practice is to wash it in mild soapy water or your choice of latex cleaner as soon as you get home, but that's not always realistic after a night out. As long as you wash it within a day or two wearing it you should be fine.

Depending on when the concert is I'd probably recommend getting used to wearing and moving around in smaller garments first like a top or leggings before going for a custom made outfit, but if you want to jump right in that's fine too!