Has the indoor "HVAC" system been upgraded? Will you be using Hepa air filtration to scrub the air inside during performances

Every one was required to wear mask's

HVAC system has been serviced upgraded and customized to fit larger filters. Also, the maintenance schedule has been increased.

I believe it has been upgraded. Was there last on Tuesday for the beach boy (s) full house and warm night- not stuffy. But the hepa filter no idea.