Two options for In-Person or Virtual events:
A. To manage an event with in-person limited attendance and unlimited virtual attendance IN ONE EVENT. See OPTION A, below.
B. For two events; an In-Person event utilizing the Limited Attendance feature built into ChapterPRO, and a second Virtual event with unlimited attendance, go to OPTION B below.
OPTION A:
A1. Edit event > RSVP tab > OPTIONS > SINGLE CHOICE > Title enter "Attendance Options" > Description enter "attending In-Person – 20 maximum" and "attending Virtually – unlimited" (use your preferred wording) > Required set to YES > Open/Close set to OPEN.

A2. Monitor the RSVP report. When attendance limit is reached for the In-Person portion of the event, edit the Description changing "attending In-Person – 20 maximum" to "FULL" > change Open/Close setting to CLOSED.
RSVP report:

RSVP tab, options section:

Viewing the RSVP tab, "attending In-Person – FULL" is no longer available to select:

OPTION B:
B1. To manage an event with in-person limited attendance and unlimited virtual attendance, IN TWO EVENTS:
Create both events:
Event 1 as an In-Person event with Limited Attendance number set in the DETAILS tab of the Event Editor (optional to have Waitlist on or off):

Event 2 as Virtual Event with Zoom link (or other streaming option) added for member to click on:

Contact support@chapterpro.com and we will link to two events. If a member visits the site and clicks on the In-Person event, but wants the Virtual event, we will add links to each of the events:
