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As long as you have enough ipads and they are all tested and logged in, there shouldn't be an issue.
For large events, I usually use Cvent or something else because of the Agenda and guest capabilities. But there's no real reason Marketo can't handle check in at this volume.
The challenge may be in fully recording walk ins or in making corrections, so be sure someone with higher Marketo access can login to the main app or consider having a special Kiosk page a manager can access.