Right now, the filter for event participants only allows filtering of 1 participant level at a time.

Sometimes we need to get a quick count on certain types of event registrants that have different participant level labels but need to be grouped together. But right now, if we have multiple participant levels, I have to export a CSV the participant list out of Raiser's Edge and filter in Excel or create a pivot table to get that number. Most often, this is something asked on-the-fly in planning meetings so it is awkward that it takes so long to try to quickly estimate.

Related to this purpose, it would be helpful if the filter had an option for "is blank" for accurate filtering and data quality control.

[There is another idea in the bank for multi-select filters but I couldn't tell if that was for a specific filter]