please elaborate what you want to do becoause we dont need keypad in rfid systems
and for attendence project you can use
you can use RTC(real time clock);to measure time of attendence
EEPROM;to save data collected i.e the entry of students
rfid module to scan rfid cards
all you will have to do is to synchronise all these systems
some projects on rfid and rtc are given on the home page of this site oly