Conference Campaigns | 2 weeks & 119 event RSVPs

Is anybody else running conference campaigns?

Either for business development (to get events and conference companies more clients) or to get bum-on-seats (get delegates to attend).

Asking because we've ran a new campaign for a conference organiser in the last 14 days and we were blown away by the results.

After sending 3,500 emails, we got a little over 200 positive replies and 119 event RSVPs.

Here was the exact subject: Invitation: [Event Name] x {{company_name}}

Anyway, I have 2 more questions;

1. Is it okay to use the words, "invited, invite, invitation" even though this is technically an invitation to purchase a ticket, in order to attend... asking because we did receive a few replies citing that this is kinda misleading - not too sure about that hence i'm asking fellow cold emailers.

2. Anybody else running conference campaigns and how are they seeing them pan out, is it a good space to niche into ? also open to sharing notes.

Thanks.