is this good for clients who will be waiting for assistant.?

Based on your question about needing something for clients waiting for assistance, I would recommend the Snom PA1 - Public Announcement System For Offce Floors Reception Areas And Waiting Rooms, available for R3242. This product would allow you to make announcements to clients waiting to help keep them informed about waiting times or calls being answered. Some other options that may work well for a waiting area are the Waiting Area Screens available from R2348.76. Screens help define the space and provide a visual barrier for privacy. I hope these suggestions are helpful! Please let me know if you need any other recommendations.

Based on your need to host 20-30 people, I would recommend the Coleman Event Shelter 12 Pro or the Coleman Pro Grey & Green Event Shelter Gazebo. Both are good sizes at 12x12m and 4.5x4.5m respectively to accommodate your guest count. The Coleman Event Shelter 12 Pro is featured in the search results for R2645. It is a sturdy and weather-resistant shelter that will provide plenty of shade. The Coleman Pro Grey & Green Event Shelter Gazebo is listed for R2799.99 and offers a similar protection from the elements. Both Coleman options are quality brands that should suit your needs well. Let me know if you need any other details on these or alternative suggestions.