Add an event RSVP

Add an RSVP to the event invitation from the email by marking Thomas Liu as 'Yes' for the Q3 Roadmap review on Tuesday at 2:00 p.m., update the guest list to include his manager, Priya Shah, and send the updated confirmation so the organizer knows attendee counts before the planning session.

Before I mark Thomas Liu as attending the Q3 Roadmap review, surface anything that would affect acceptance — show any calendar conflicts, list whether his manager Priya Shah was already invited, and surface travel or remote details so the organizer won't be surprised by last-minute conditions.

Thomas Liu replied to the event invite 'I'll try to make it' and didn't use RSVP. I'm unclear if I should mark him as tentative or reach out. I'm worried counting him as attending will overcommit the room and undercounting will upset his manager. What's the best next move to resolve his status quickly without creating extra email threads?

I keep starting meetings without accurate headcounts because I fail to confirm tentative or 'maybe' replies; we run out of seats and stakeholders miss decisions. What habit change will give me reliable RSVP data 24 hours before meetings, including a single-sentence message to send to tentative attendees and a cutover rule for room sizing?