You have an event registration form in NetCommunity with additional donations enabled. You want users to be able to make a donation without purchasing an event ticket.
If users enter an additional donation and do not purchase a ticket, they may see the following error when proceeding:
Please select an event & enter quantity to register
For an event registration form, a ticket option must be selected in order to make the additional donation. To allow users to only make an additional donation, you would need to enable a $0.00 event price option. This would allow the user to select the $0.00 price option, and then enter their desired additional donation amount.