For an anniversary, the venue contributes heavily to the experience. A generic conference room rarely suits a celebration of 25 years of entrepreneurship. Choose a place that says something about your identity. A place that shows what you stand for, or what you want to convey.
For anniversaries, four types of venue work well. Historic castles or country estates suit those who want to convey timelessness and stature. Industrial heritage offers contrast and character. Exclusive city halls give prestige and a central location. Or choose your own location, fully transformed, for an authentic and personal experience.
Take into account: accessibility for your guests, capacity, technical possibilities, and whether catering is in-house or external. Always request an exclusivity option. You don't want another company celebrating in the same space at the same time.