Suggestion:
If the event starts at 18:00, you could/should release a rough changelist maybe at 15:00.
That way the participants will know what they should try out and where to look for changes, instead of blind guessing. Otherwise i'll bet, the testers will report significant changes at each weapon system, even if there wasnt any changes at all.
But you shouldnt release the exact numbers. Just give them a rough idea where to look.
For example:
uslmg_m249acog
Single Shot Settle Time: slightly reduced
ObjectTemplate.recoil.recoilForce: slightly increased
Probably just use terms from "reduced" to "slightly reduced", "slighty increased" to "increased".
If you need help with it, i could help you. I'd just need the "weapons_client_patchXXX.zip".