No, they are by invite only, for select season ticket holders. This is the first time I can recall them doing anything during OTAs. Apparently, this is just another one of the things K. Demoff is doing to endear the organization to the ST holders. I have attended a few of the luncheons over the past few years as well, and he is always quite accommodating.
Its my understanding, this is a small and very manageable number, as those lucky enough to attend will be in one of the inside rooms, with K. Demoff viewing the practice. They will not have the field roped off as they do throughout training camp, so access will be limited.