Why not both? If any committee member has their name published in a "find me and let's talk" format, provide said members with a list of resources and do a quick "know where to go and chat," and give them a simple way of recapping that converstaion?
I know people just love forms, but there could be a really easy for and QR code on a one-pager that they're given beforehand.
1) Publish committee member list of members that don't mind random people approaching them (barrier one for those with social anxiety)
2) Give committee member a one-pager of places that are available for impromptu chats (for 2 mins or 20 mins scenarios)
3) Ask that participating committee members fill out a form that captures their notes on the conversation with optional fields for who they talked to (ensuring confidentiality where wanted)
4) Make members aware of who they can talk to beyond the roundtables. Wednesday @ the roundtables - show participating committee members and ask them to stand and give their best parade/Miss America wave. Thursday - re-emphasize that this year has a special emphasis on the community voice as we actively onboard new communities, products, etc., and encourage them to find participating committee members. Show the list onscreen and ask those participating committee members to stand up and wave so people know who they are.
5) Profit... I mean, get feedback.
It's flexible, gets willing people that are open to and want to be points of contacts for members, and provides two points in the conference for members to know who to find for a conversation.
... at least, my 5:20 am CST brain thinks this is a good idea. Caffeinated/awake version of me may have more to add or words betterly than I am now.
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Best Regards,
Basil Malik
President/CEO
e:
basil@malik-inc.com------------------------------