This has been always very confusing for us to know who have RSVP the event recently so we can tag, check or inform him.

Any idea how to sort event participation based on time they have RSVP'ed the event?

Another new sign up, just now slided inside the random place.

Please advise on how to fix this?

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I really doubt that's based on member ID as guy who joined at 53 now is 2 month old than the last 4-5 signup in the end, fairly new guys.

Nope, my bad. Made a test and it's sorting by the order they rsvped:

 

Nope, my bad. Made a test and it's sorting by the order they rsvped:

Nope its not, I have noticed this so many times.

I so wish if it sort based on RSVPed time, but they are not.

Thankfully I have posted above 3 images and the middle one can verify that very easily. 52nd number signed up in 14th position.......! which was not there 10 minutes prior at 51 signups.

Mine is mate. Yours may not.  So instead of laugh on who’s trying to help you, do something, like submit a ticket.