A lot of changes

1. Button click now trigger a function; all codes inside are now store
in another function with no inputs
2. seeevents.cs and new events.cs should(need to be test) be able to
send request/event without having to go back to click the send/request
button
3. 2 new string variable for newevents.cs and seeevents.cs to access
4. minor changes in the sendButton() function, added an (almost)
identical function for request sending
5. removed some useless hidden codes
6. 3 new string array in both events for attendance
7. newevents.cs and seeevents.cs now trigger the sendButton() directly
8. Progress update on README