Non-Profit org website development and maintenance

We need following
- landing intro - pics and video
- info on programs -
—- Ramadan
—- other events
- Calendar of events
- Event registration integration with popular platforms
- masjid plans
- donation page for programs and masjid etc links to various options to send money securely
- forms for feedback and email sign ups or ways to link to WhatsApp group
- easy way to manage website updates - pics :text by us

Services needed:
- website design, development
- maintenance and updates

Recommendations on robust existing platforms to use