Hi Abhishek,
You have to code in activity component search view inbound plug, you can set search parameters in search collection and then call the event eh_onsearch.
Your navigation should be from webpage to Activity search page by using outbound and inbound plugs. You can set some reference in outbound plug of the webpage for identification in activity inbound plug, so that system will show search results only for your scenario.
Best Regards,
Dharmakasi.