I've always thought that the biggest gathering a masjid has - even bigger than the annual milad etc. - is the weekly juma one. that's because everyone prays juma - you will never see the same faces at your regular events. take my local masjid - you will never get even a milad un nabi event where you can fill all 3 halls to the brim. so this is a fantastic opportunity to preach to people who you'd never get to address otherwise and we're getting this chance every week!