Sourced pipeline means the event initiated the commercial opportunity under your agreed attribution policy. Influenced pipeline means an existing opportunity had relevant event engagement. Report these separately; the same opportunity should not be counted twice in a combined total.
Use a CRM campaign or equivalent record with invited, accepted, attended and follow-up statuses. Associate contacts with opportunities and preserve timestamps. Record what changed: a new stakeholder joined, a discovery meeting occurred or an agreed evaluation began.
Choose a window that fits your sales cycle. A ninety-day review can be useful, but it is a reporting choice rather than a universal standard. Keep later outcomes visible without continuously extending the window to improve results.
Show attendance by target account, qualified follow-up, new opportunities and changes to existing opportunities. Report closed-won outcomes separately from open pipeline.
Comparable accounts that did not attend can provide context, but invitation and attendance selection create bias. Do not present that comparison as proof of causal lift without a stronger design.
The useful result is a traceable account history that explains the event's role alongside other touches, not a large pipeline number attached to everyone who registered.